Additives

Items 1 to 48 of 320 total

Keeping your aquarium in tip-top shape is easy with this incredible assortment of high-quality additives. While some online retailers carry only a handful of additives, at Big Al’s Pets, we offer over 300 different types for your aquarium. These aquarium additives make it easy to keep the water clear and conditioned so your fish stay healthy and happy. Plus, many of our products are on sale at any given time, so it’s easy to keep your tank in great shape while keeping some extra money in your wallet.

Our helpful categories make it easy to narrow down your choices from this vast selection of products. You can quickly choose between biological, freshwater and marine additives to get the correct match for your fish. In addition, you’ll find helpful products like pH buffers and controllers, water clarifiers and water conditioners, all of which will contribute to a healthier underwater habitat for your pets.
  • Kent Marine Black Water Expert - 16 fl oz
    Contains natural humic and tannic acids that simulate water conditions found in the Amazon region of South America, Southeast Asia and Western Africa. Excellent for Discus, Tetras, Angelfish, and all other soft water fish. Encourages spawning.

    Regular Price: USD 7.99

    Sale Price USD 5.99

    Regular Price: USD 7.99

    Sale Price USD 5.99

  • NutraFin Cycle Biological Water Supplement - 2 L
    Immediately establishes a safe biological aquarium environment, features new high concentration formula, reduces fish loss and establishes essential conditions in new aquarium set-ups. Fast acting responsive ammonia and nitrite elimination.

    Regular Price: USD 67.99

    Sale Price USD 39.99

    Regular Price: USD 67.99

    Sale Price USD 39.99

  • NutraFin Cycle Biological Water Supplement - 16.9 fl oz
    Immediately establishes a safe biological aquarium environment, features new high concentration formula, reduces fish loss and establishes essential conditions in new aquarium set-ups. Fast acting responsive ammonia and nitrite elimination.

    Regular Price: USD 21.99

    Sale Price USD 9.99

    Regular Price: USD 21.99

    Sale Price USD 9.99

  • Tetra Start Zyme Tablets - 8 Pack
    • Complete water conditioner
    • For freshwater, or saltwater aquariums
    • Removes chlorine, chloramine and heavy metals
    • Reduces stress in fish
    • Stimulates fish's protective slime coat

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Seachem Reef Complete - 500 ml
    Reef Complete is a concentrated (160,000 mg/l) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in seawater without affecting pH (formulated at pH 8.3). calcium and carbonates are essential to all coral growth.
    USD 9.14
    USD 9.14
  • Kent Marine Black Water Expert - 8 fl oz
    Contains natural humic and tannic acids that simulate water conditions found in the Amazon region of South America, Southeast Asia and Western Africa. Excellent for Discus, Tetras, Angelfish, and all other soft water fish. Encourages spawning.

    Regular Price: USD 4.99

    Sale Price USD 3.99

    Regular Price: USD 4.99

    Sale Price USD 3.99

  • API Proper pH 7.0 - 250 g
    Proper pH 7.0 neutralizes chlorine, detoxifies heavy metals, and adds electrolytes to the aquarium. Contains Aloe Vera, a proven natural stress reducer and healing agent. Will lower or raise the pH until 7.0 is reached. pH will not rebound.

    Regular Price: USD 6.99

    Sale Price USD 5.99

    Regular Price: USD 6.99

    Sale Price USD 5.99

  • Seapora Betta Water - 1L
    Seapora Betta Water contains the healing power of Aloe Vera, along with trace elements and minerals that will enhance vitality and overall health. Its chlorine free, free of heavy metals, and pH balanced. Stimulates the slime coat and reduces stress.

    Regular Price: USD 3.99

    Sale Price USD 2.49

    Regular Price: USD 3.99

    Sale Price USD 2.49

  • Tetra AmmoniaSafe Tablets - 8 pk
    • For fresh or saltwater aquariums.
    • Removes harmful chlorine & chloramine from tap water
    • Reduces ammonia stress in fish
    • Protects fish from ammonia burn

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Microbe-Lift Aquarium Nite-Out II - 1 gal
    • This decreases ammonia and nitrite toxins in aquarium water
    • Creates, encourages or evens-out and maintains nitrification
    • Method uses nitrosomonas, nitrospira and nitrobacto strains
    • This formula is specially created to support marine life water

    Regular Price: USD 55.99

    Sale Price USD 42.99

    Regular Price: USD 55.99

    Sale Price USD 42.99

  • Microbe-Lift Gravel & Substrate Cleaner - 1 gal
    • Made to clean up organic wastes, like muck & sludge
    • This method will prevent bad toxins from developing
    • Clarifies your aquarium water after 48-96 hours of use
    • Uses cellulosic matter & select biological accelerators

    Regular Price: USD 43.49

    Sale Price USD 34.99

    Regular Price: USD 43.49

    Sale Price USD 34.99

  • API Goldfish Aquarium Cleaner - 4 fl oz
    Helps keep gravel clean and removes organic sludge, works naturally to break down solid fish waste, and helps reduce toxic ammonia and nitrite by boosting the effectiveness of the biological filter in established aquariums.

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • API Proper pH 6.5 - 240 g
    Proper pH 6.5 neutralizes chlorine, detoxifies heavy metals, and adds electrolytes to the aquarium. Contains Aloe Vera, a proven natural stress reducer and healing agent. Proper pH 6.5 will lower or raise the pH until 6.5 is reached. pH will not rebound.

    Regular Price: USD 6.99

    Sale Price USD 5.99

    Regular Price: USD 6.99

    Sale Price USD 5.99

  • NutraFin Cycle Biological Water Supplement - 8.45 fl oz
    Immediately establishes a safe biological aquarium environment, features new high concentration formula, reduces fish loss and establishes essential conditions in new aquarium set-ups. Fast acting responsive ammonia and nitrite elimination.

    Regular Price: USD 12.29

    Sale Price USD 6.99

    Regular Price: USD 12.29

    Sale Price USD 6.99

  • Tetra Correct pH 7.0 Tablets - 8 pk
    • Maintains pH of aquarium water between 6.8-7.2
    • Holds correct pH for several weeks
    • Prevents stress on fish from sudden pH changes
    • Promotes favorable conditions for tropical fish and live plants
    • Helps lower harmful ammonia levels

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Kent Marine Reef Starter Kit
    The Kent Marine Reef Starter Kit is a perfect start-up kit for reef type aquariums. It provides three of the most important supplements for marine invertebrate keeping: calcium, strontium, and iodide (a 4 oz bottle of each product).

    Regular Price: USD 10.49

    Sale Price USD 8.99

    Regular Price: USD 10.49

    Sale Price USD 8.99

  • pH Regulator - 8 fl oz
    • Maintains the ideal long-term pH and alkalinity
    • Replenishes the beneficial vitamins & minerals
    • Supports health, activity, coloration and vitality
    • Phosphate & formaldehyde free pH Regulator
    • No acids or bases known to quickly change pH

    Regular Price: USD 5.49

    Sale Price USD 3.99

    Regular Price: USD 5.49

    Sale Price USD 3.99

  • API Goldfish Protect - 4 fl oz
    API Goldfish Protect makes tap water safe for goldfish. It removes chlorine and chloramines, detoxifies ammonia released by goldfish, enhances the protective slime coat of fish, and contains trace minerals for fish health.

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Freshwater Phosphate Remover - 4 oz
    • Clears up cloudy water while rapidly removing phosphate
    • Elimination rate is between 1.0 to 1.5 ppm of phosphate
    • Strictly suitable to use for ornamental and aquarium fish
    • Dose accordingly for pH and alkalinity to remain the same

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Aquarium Clarifier - 8 fl oz
    • This Aquarium Clarifier quickly clears up cloudy water
    • Clumps particles from left-over food and other debris
    • This Clarifier is free of copper as well as formaldehyde
    • Has traces of iron to increase effectiveness and safety
    • Safe for fish, plants, invertebrates & soft water areas

    Regular Price: USD 5.49

    Sale Price USD 3.99

    Regular Price: USD 5.49

    Sale Price USD 3.99

  • Kent Marine Marine Starter Kit
    A perfect start-up kit for marine type aquariums. Includes the following KENT Marine products in 4 oz sizes: Essential Elements, Pro-Ammonia Detox, and Pro-Buffer dKH

    Regular Price: USD 9.99

    Sale Price USD 8.99

    Regular Price: USD 9.99

    Sale Price USD 8.99

  • Kent Marine Essential Elements - 8 fl oz
    Essential Elements replaces biologically important trace minerals necessary to a healthy marine aquarium. These elements are depleted by natural biological processes or removed unintentionally through protein skimming, ozone, and carbon filtration.

    Regular Price: USD 6.49

    Sale Price USD 5.49

    Regular Price: USD 6.49

    Sale Price USD 5.49

  • Kent Marine Lugol's Solution - 1 fl oz
    Kent Marine Lugol's Solution provides key nutrients for marine invertebrates and fish while promoting coral polyp expansion. Improves coloration and prevents bleaching of corals. Can be used as a dip for stony and soft or leather corals.

    Regular Price: USD 10.99

    Sale Price USD 8.99

    Regular Price: USD 10.99

    Sale Price USD 8.99

    Out of stock

  • Seachem Reef Complete - 250 ml
    Reef Complete is a concentrated (160,000 mg/l) optimized blend of ionic calcium designed to restore and maintain calcium to levels found in seawater without affecting pH (formulated at pH 8.3). calcium and carbonates are essential to all coral growth.
    USD 5.97
    USD 5.97
  • API Betta Complete Water Conditioner - 1.25 fl oz
    Instantly makes tap water safe for Bettas. Contains Aloe Vera to help stimulate their natural protective slime coating, and repair fins and tissue damaged from handling and disease. Detoxifies chlorine, chloramine, ammonia and heavy metals.

    Regular Price: USD 3.49

    Sale Price USD 2.49

    Regular Price: USD 3.49

    Sale Price USD 2.49

  • Tropic Marin Bio-Calcium Original Balling Liquid Set (A+B+C) - 3 x 1 L
    • The 3 components used in "The Balling Method" of supplementation
    • Allows independent dosage of calcium (Part A) and carbonates (Part B)
    • Sodium chloride free sea salt (Part C) maintains critical ionic balance
    • Stable calcium dosage = ideal conditions for coral/coralline algae growth
    • Convenient liquid set includes pre-mixed solutions in ideal concentrations

    Regular Price: USD 37.99

    Sale Price USD 25.99

    Regular Price: USD 37.99

    Sale Price USD 25.99

  • Microbe-Lift Aquarium Nite-Out II - 8 fl oz
    • This decreases ammonia and nitrite toxins in aquarium water
    • Creates, encourages or evens-out and maintains nitrification
    • Method uses nitrosomonas, nitrospira and nitrobacto strains
    • This formula is specially created to support marine life water

    Regular Price: USD 5.99

    Sale Price USD 4.99

    Regular Price: USD 5.99

    Sale Price USD 4.99

  • Tropic Marin Bio-Calcium Original Balling Set (A+B+C) - 3 x 1 kg
    • The 3 components used in "The Balling Method" of supplementation
    • Allows independent dosage of calcium (Part A) and carbonates (Part B)
    • Sodium chloride free sea salt (Part C) maintains critical ionic balance
    • Stable calcium dosage = ideal conditions for coral/coralline algae growth
    • Individual salts dissolve easily into high quality, dose-ready solutions

    Regular Price: USD 39.99

    Sale Price USD 29.99

    Regular Price: USD 39.99

    Sale Price USD 29.99

  • Exotic Betta Care - 2 oz
    • Neutralizes chlorine, chloramines, heavy metals & removes ammonia
    • Vitamins, minerals electrolytes, slime coat conditioners & emollients
    • Supports all bettas special necessities for optimal aquarium fish water

    Regular Price: USD 2.99

    Sale Price USD 1.99

    Regular Price: USD 2.99

    Sale Price USD 1.99

  • Tetra BettaSafe - 1.69 fl oz
    BettaSafe quickly neutralizes chlorine, chloramines, and heavy metals in tap water and adds a protective slime coating. The small container with built-in dropper is ideal for dosing the typical Betta bowl/habitat.

    Regular Price: USD 2.39

    Sale Price USD 1.99

    Regular Price: USD 2.39

    Sale Price USD 1.99

  • Kent Marine Pro-Clear Marine Clarifier - 16 fl oz
    Pro-Clear Marine Clarifier clears cloudy water caused by chemical reactions, disturbed detritus, etc. This special marine formula contains a long chain polymer that is attracted to the dirt particles and other organic materials.

    Regular Price: USD 10.49

    Sale Price USD 8.99

    Regular Price: USD 10.49

    Sale Price USD 8.99

  • Red Sea Coral Coloration ABCD Supplements - 3.4 fl oz - 4 pk
    • A = Halogens (I2, Br2, F2)
    • B = Potassium and Boron
    • C = Fe & 7 Complementary Metals
    • D = 18 Bioactive Trace Elements
    • Brings out the natural coral colors

    Regular Price: USD 19.99

    Sale Price USD 14.99

    Regular Price: USD 19.99

    Sale Price USD 14.99

  • Hikari Betta Ultimate 0.08 fl oz
    • Destroys Chloramines, Chlorine, and Ammonia
    • Detoxifies Nitrite and Heavy Metals (including copper)
    • Adds Essential Electrolytes For Good Health
    • Buffers The Water (boosts alkalinity)
    • Reduces Stress
    USD 1.29
    USD 1.29
  • Kent Marine Strontium & Molybdenum - 8 fl oz
    Provides elements needed for proper growth and health of hard and soft corals. Strontium is very similar to calcium as invertebrates use it to form skeleton structures. Coral responds by staying open longer as strontium aids tissue adhesion to skeleton.

    Regular Price: USD 5.99

    Sale Price USD 4.99

    Regular Price: USD 5.99

    Sale Price USD 4.99

  • Red Sea A & B Coral Nutrition Program Kit - 100 ml
    • Photosynthetic & non-photosynthetic corals
    • Bottle A is a Concentrated Energy Source
    • Bottle B features Amino Acids and Vitamins
    • Benefits digestion, growth and coloration
    • Gives a huge energetic value after digestion

    Regular Price: USD 14.99

    Sale Price USD 11.99

    Regular Price: USD 14.99

    Sale Price USD 11.99

  • UltraLife Aiptasia & Majano Remover - 2.43 oz
    • 100% all natural solution in order to treat over 300 anemones
    • Simple and effective formula assures that is will keep reefs safe
    • Assures that when used, the water chemistry will not be altered
    • Included is a 3 ml syringe to apply to the tops of anemones

    Regular Price: USD 8.99

    Sale Price USD 5.99

    Regular Price: USD 8.99

    Sale Price USD 5.99

  • Reef Foundation ABC+ Liquid Supplement - 250 ml - 3 pk
    • Calcium (Ca) and Strontium (Sr) complex in bottle A
    • Has carbonate (Alk) and buffer complex in bottle B
    • Has Magnesium (Mg) element complex in bottle C
    • This will promote positive coral health and growth
    • Will achieve balanced formation of coral skeletons
    USD 22.99
    USD 22.99
  • Microbe-Lift Ammonia Remover - 16 oz
    • 16 fl oz's will treat up to 960 gallons of your aquarium water
    • Removes chlorine, chloramines & high levels of ammonia
    • Does not alter aquarium alkalinity, pH or biological filtration
    • Only salicylate-based (indole-phenol) test should firmly be used
    • Do not use with permanganate or chlorite-based treatments
    USD 6.99
    USD 6.99
  • Kent Marine Essential Elements - 64 fl oz
    Essential Elements replaces biologically important trace minerals necessary to a healthy marine aquarium. These elements are depleted by natural biological processes or removed unintentionally through protein skimming, ozone, and carbon filtration.

    Regular Price: USD 31.99

    Sale Price USD 27.99

    Regular Price: USD 31.99

    Sale Price USD 27.99

  • Two Little Fishies AcroPower Amino Acid Formula for SPS Corals - 250 ml
    • Unique blend of amino acids used by corals
    • Promotes accelerated development of skeletal structures
    • Enhances the natural coloration of stony corals
    • Ideal for Acropora, Montipora, Stylophora, and others
    • Made in the U.S.A.

    Regular Price: USD 12.54

    Sale Price USD 10.99

    Regular Price: USD 12.54

    Sale Price USD 10.99

  • Kent Marine Liquid Calcium - 16 fl oz
    Kent Marine Liquid Calcium is an easy to dose liquid formulation that provides the essential calcium that corals and many invertebrates require. Liquid Calcium will not affect pH or buffering capacity. Dose as directed.

    Regular Price: USD 10.99

    Sale Price USD 9.49

    Regular Price: USD 10.99

    Sale Price USD 9.49

  • Kent Marine Iodide - 16 fl oz
    Kent Marine Iodide replaces iodide needed for proper growth and health of invertebrates and macro-algae. Iodide is rapidly depleted up in the system, and removed through protein skimming, ozone and filtration.

    Regular Price: USD 7.79

    Sale Price USD 5.99

    Regular Price: USD 7.79

    Sale Price USD 5.99

  • Kent Marine Iodide - 64 fl oz
    Kent Marine Iodide replaces iodide needed for proper growth and health of invertebrates and macro-algae. Iodide is rapidly depleted up in the system, and removed through protein skimming, ozone and filtration.

    Regular Price: USD 25.99

    Sale Price USD 23.39

    Regular Price: USD 25.99

    Sale Price USD 23.39

  • Tetra BettaSafe Kit Tablets - 8 pk
    • Makes tap water safe for Bettas immediately
    • Removes chlorine, chloramine and heavy metals
    • Use in any size fishbowl up to two gallons
    • Keeps water healthy with no mess, no measuring - in no time at all

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Seachem Prime - 500 ml
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 12.02
    USD 12.02
  • Two Little Fishies AcroPower Amino Acid Formula for SPS Corals - 1 L
    • Unique blend of amino acids used by corals
    • Promotes accelerated development of skeletal structures
    • Enhances the natural coloration of stony corals
    • Ideal for Acropora, Montipora, Stylophora, and others
    • Made in the U.S.A.

    Regular Price: USD 31.54

    Sale Price USD 24.99

    Regular Price: USD 31.54

    Sale Price USD 24.99

  • Tetra AquaSafe Tablets - 8 pk
    • Makes tap water safe
    • Complete Fizz Tab formula works in seconds
    • Neutralizes chlorine, chloramines, and heavy metals

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Zoo Med Betta H2O Conditioner - 0.5 fl oz
    • Instantly conditions water
    • Removes chloramines and chlorine
    • Detoxifies nitrate and heavy metals
    • Relieves stress and promotes healing

    Regular Price: USD 1.49

    Sale Price USD 1.19

    Regular Price: USD 1.49

    Sale Price USD 1.19

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