Additives

Items 1 to 48 of 356 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.
  • Seachem Prime - 1 L
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 22.60
    USD 22.60
  • Seachem StressGuard - 500 ml
    • Reduces handling or transportation stress
    • Promotes healing & is an antiseptic for fish
    • This is suitable for marine and freshwater
    • Does not coat resins or clog filter systems
    • Does not unbalance pH levels at any dose
    USD 12.13
    USD 12.13
  • 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

  • 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

  • API Quick Start - 16 oz
    • Contains nitrifying bacteria to help prevent fish loss
    • This immediately starts the natural aquarium cycle
    • Converts toxic ammonia into nitrites then to nitrates
    • Instantly add fish in marine & freshwater set-ups
    • Use when either ammonia or nitrite are detected
    USD 15.29
    USD 15.29
  • 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 6.99

    Regular Price: USD 7.99

    Sale Price USD 6.99

  • 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

  • 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

  • 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.
    USD 8.29
    USD 8.29
  • Kent Marine Cichlid Essential - 16 fl oz
    Kent Marine Cichlid Essential replaces important trace minerals that are used by fish and plants or removed unintentionally through carbon filtration. Works well where native waters are hard and have a pH above 7.8.

    Regular Price: USD 9.99

    Sale Price USD 8.99

    Regular Price: USD 9.99

    Sale Price USD 8.99

  • 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

  • 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

  • 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 6.99

    Sale Price USD 4.99

    Regular Price: USD 6.99

    Sale Price USD 4.99

  • 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

  • Big Al's Multi-Purpose Water Conditioner - 1 fl oz
    Big Al's Multi-Purpose Water Conditioner helps repair the damaged tissue of tropical fish and marine fish with a unique formula that contains aloe vera. Dechlorinates source water and neutralizes chloramine- which does not evaporate from water.
    USD 0.99
    USD 0.99
  • 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

  • Hikari Betta Revive - 0.08 fl oz
    • Prevents & Controls Protozoan Diseases
    • Prevents & Controls Bacterial Diseases
    • Prevents & Controls Fungal Diseases
    • Helps Regenerate Damaged Fins & Tails
    • Active Ingredient Speeds Recovery
    USD 1.79
    USD 1.79
  • 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

  • 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

  • Kordon Amquel - 1 gal
    • The Original AmQuel Product For Chlorine, Chloramine, And Ammonia Removal
    • A True One-step Liquid Chlorine, Chloramine, And Ammonia Remover
    • Nontoxic To Fishes, Aquatic invertebrates, And Other Aquatic Life
    • Fast Acting Within Five Minutes, Simple To Use
    • Effective In Removing Toxic Pheromones From The Water
    USD 38.99
    USD 38.99
  • Seachem Reef Calcium - 500 ml
    Reef Calcium is a concentrated (50,000 mg/l) bio-available polygluconate complexed calcium intended to maintain calcium in the reef aquarium without altering pH (formulated at pH 8.2).
    USD 9.49
    USD 9.49
  • 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

  • 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

  • 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

  • Acurel African Rift Lake Cichlid Salt - 1 lb
    • Allows Cichlids to easily thrive & reproduce
    • Promotes noticeably intense, vibrant color
    • Mimics the elements of their environment
    USD 5.99
    USD 5.99
  • 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.
    USD 3.39
    USD 3.39
  • 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

  • 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

  • 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

  • API Quick Start - 4 oz
    • Contains nitrifying bacteria to help prevent fish loss
    • This immediately starts the natural aquarium cycle
    • Converts toxic ammonia into nitrites then to nitrates
    • Instantly add fish in marine & freshwater set-ups
    • Use when either ammonia or nitrite are detected
    USD 7.89
    USD 7.89
  • API Quick Start - 8 oz
    • Contains nitrifying bacteria to help prevent fish loss
    • This immediately starts the natural aquarium cycle
    • Converts toxic ammonia into nitrites then to nitrates
    • Instantly add fish in marine & freshwater set-ups
    • Use when either ammonia or nitrite are detected
    USD 11.29
    USD 11.29
  • API Marine Quick Start - 16 oz
    • Contains nitrifying bacteria to help prevent fish loss
    • This immediately starts the natural aquarium cycle
    • Reef safe method to reduce ammonia and nitrites
    • Allows for instant addition of fish in marine set-ups
    • Use with live rocks, corals or fish & after medicating
    USD 15.39
    USD 15.39
  • 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

  • Kordon Amquel Plus - 1 gal
    • AmQuel+ is a unique water conditioner providing actions needed for safe aquarium and pond keeping for fishes and invertebrates (snails, shrimp, coral reef animals, etc.) in fresh, brackish, and salt water
    • Nontoxic and saves on the need for as many water changes as would otherwise be required
    • Removes 33 ppm (= 33 mg/L) of all chlorines including those chlorines in chloramines from the water
    • Removes/detoxifies all of the kinds of toxic nitrogen compounds in the water
    • Removes/detoxifies all forms of ammonia/ammonium/nitrites/nitrates from the water, including ammonia in chloramines
    USD 46.99
    USD 46.99
  • 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

  • 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.
    USD 3.39
    USD 3.39
  • 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.
    USD 8.79
    USD 8.79
  • 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

  • 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.
    USD 3.49
    USD 3.49
  • Acurel F Water Clarifier - 50 ml
    • Keeps freshwater aquariums crystal clear
    • Fights the negative effects of over feeding
    • Ideal to use for improving filter efficiency
    • Quick acting, natural & safe for fish/plants
    • This will not harm the beneficial bacteria
    USD 6.49
    USD 6.49
  • 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

  • Red Sea Reef Foundation Supplement - B (Alk) - 1.32 gal
    • Foundation A is a part of the Red Sea's Complete Reef Care system
    • 1 ml raises the alkalinity of 25 gallons of water by 0.36 meq/l (1dKH)
    • Each Foundation has a convenient measuring cup for simple dosing
    USD 69.99
    USD 69.99
  • 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
    USD 33.59
    USD 33.59
  • 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 6.19
    USD 6.19
  • 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
  • Python Multi-Purpose Water Conditioner - 67.6 fl oz
    • Makes tap water safe for aquarium usage by neutralizing toxins
    • Designed for use with freshwater and marine aquariums
    • Herbal extracts help to calm fish and relieve stress
    • 67.6 fl oz of solution treats 4.000 U.S. gal of aquarium water
    • Part 1 of the Python three step water treatment system
    USD 11.99
    USD 11.99
  • 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

  • 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

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