Additives

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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.
  • Tropic Marin Bio-Calcium Actif
    Bio-Calcium Actif is the perfectly balanced calcium additive with stabilizing action, bringing the pH and alkalinity into the ideal range for optimum results in growing coral and calcareous red algae. Supply calcium to corals without harmful substances.

    Price From: USD 26.99

    Price From: USD 26.99

  • API pH Up
    By neutralizing acidic substances in the aquarium, pH Up effectively makes the water more alkaline. Adjusting pH to the proper level will improve fish health, disease resistance, coloration, and breeding.

    Price From: USD 3.49

    Price From: USD 3.49

  • ATM Outbreak! Marine Premium Biological Maintenance
    • Biological blend keeps aquariums clean and odor free
    • Removes organic buildup and improves water quality
    • Ensures a clean and healthy biofilter
    • Made in the U.S.A.

    Price From: USD 15.99

    Price From: USD 15.99

  • API Stress Coat Marine
    Fish & tap water conditioner. The only marine water conditioner with the healing power of Aloe Vera. Developed for use with a protein skimmer: will not cause foaming. Removes chlorine, chloramines and ammonia from tap water.

    Price From: USD 6.99

    Price From: USD 6.99

  • Big Al's Multi-Purpose Bio-Clean
    Big Al's Multi-Purpose Bio-Clean reduces the time and need for cleaning power filters, gravel and interior aquarium surfaces. Bio-Clean will dissolve sludge in your aquarium caused by fish waste, over-feeding and other decaying matter.

    Price From: USD 2.49

    Price From: USD 2.49

    Out of stock

  • Big Al's Multi-Purpose Bio-Support
    Big Al's Multi-Purpose Bio-Support stimulates growth of beneficial bacteria that will break down harmful organic compounds that cause dangerous toxic conditions for your fish. Ensures a healthy biological filter, good water quality, and a clean aquarium.

    Price From: USD 1.99

    Price From: USD 1.99

    Out of stock

  • Big Al's Multi-Purpose Water Conditioner
    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.

    Price From: USD 1.49

    Price From: USD 1.49

  • Microbe-Lift Freshwater Water Clarifier Plus
    • Attracts, coagulates & sinks dirt to be filtered out
    • Non-hazardous to aquarium fish life or plant life
    • Water Clarifier Plus will only improve your filtration
    • 4 fluid ounces will treat up to 470 gallons of water

    Price From: USD 4.77

    Price From: USD 4.77

  • Microbe-Lift Aquarium Nite-Out II
    • 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

    Price From: USD 6.80

    Price From: USD 6.80

  • Kent Marine Cichlid Chemistry
    Kent Cichlid Chemistry is specially formulated to provide natural water chemistry for African Cichlids and other Rift Lake fish without significantly raising pH. Phosphate and nitrate free.

    Price From: USD 10.49

    Price From: USD 10.49

  • Kent Marine Turbo-Calcium
    Kent Marine Turbo-Calcium provides supplemental calcium to reef inhabitants such as corals, snails, hard tube worms and clams, and promotes the growth of purple, pink, and green calcareous algae. Should be used by experienced reef keepers.

    Price From: USD 7.99

    Price From: USD 7.99

  • Kent Marine Iron & Manganese
    Kent Marine Iron & Manganese supplements iron, manganese, potassium, and other micronutrients to spur saltwater macro-algae and freshwater plant growth. Does not contain ingredients that cause undesirable algae growth.

    Price From: USD 6.99

    Price From: USD 6.99

  • Microbe-Lift Special Blends
    • Helps to break down decaying organic matter and cycle elements
    • Reduces maintenance & lowers ammonia and nitrates from water
    • Breaks down protein foam and residue on gravel, plants and rocks
    • Odors will be eliminated and water clarification will be activated
    • Plant growth is naturally stimulated and presents better absorption

    Price From: USD 6.00

    Price From: USD 6.00

  • Carib Sea BioMagnet Clarifier
    BioMagnet imparts a positive electrical charge as a bacterial attractant. Quickly seeks out and encapsulates suspended particles, enabling the positively charged particles to be drawn to the filter. The result is crystal clear water, fast!

    Price From: USD 6.99

    Price From: USD 6.99

  • Carib Sea CoralUp
    • Complete reef calcium engineered for skeletal coral growth
    • Patented dual method approach contains real aragonite!
    • Naturally occurring carbonate supports pH of reef systems
    • With an additional supply of iodine, strontium, and magnesium
    • Each 5ml capful of contains over 170,000 ppm of calcium

    Price From: USD 13.99

    Price From: USD 13.99

    Out of stock

  • Kent Marine Liquid Calcium Reactor
    Kent Marine Liquid Calcium Reactor provides the same results as costly calcium reactor systems without the investment. It will raise aquarium concentrations of calcium, magnesium, strontium, trace minerals, and carbonates (alkalinity/buffering capacity).

    Price From: USD 33.99

    Price From: USD 33.99

    Out of stock

  • NutraFin Waste Control Biological Water Additive
    Helps reduce aquarium maintenance by helping to reduce waste in gravel, power filters, decoration and on interior aquarium surfaces. Rapidly reduces organic waste from overfeeding, fish waste and other decaying material such as plant leaves.

    Price From: USD 5.99

    Price From: USD 5.99

  • NutraFin Aqua Plus Water Conditioner
    Protects scales, fins, neutralizes chlorine, chloramines, and undesirable metals. With patented stress relief function with the inclusion of pure herbal extracts. A complete tap water conditioner that improves aquatic environments.

    Price From: USD 3.49

    Price From: USD 3.49

  • Seachem Reef Plus
    Seachem Reef Plus is a full spectrum reef supplement containing trace elements, vitamins, and amino acids demonstrated to have a positive impact on the growth of corals and other reef creatures. Provides nutrients available from tropical reef waters.

    Price From: USD 10.29

    Price From: USD 10.29

  • Carib Sea PurpleUp
    CaribSea PurpleUp is a pink and purple coralline algae accelerator. Since PurpleUp is not a fertilizer, it does not promote the growth of nuisance algae. PurpleUp delivers calcium, strontium, magnesium, and carbonate. Also replenishes iodine.

    Price From: USD 9.49

    Price From: USD 9.49

  • Red Sea Reef Energy
    • Contains a blend of carbohydrates in a readily accessible format for corals
    • Grows parallel to the energy provided by symbiotic zooanthealle algae
    • Ingredients of Energy A should be used in conjunction with Reef Energy B

    Price From: USD 99.99

    Price From: USD 99.99

  • API Proper pH 8.2
    Proper pH 8.2 neutralizes chlorine, detoxifies heavy metals, and adds electrolytes to the aquarium. Contains Aloe Vera, a proven natural stress reducer and healing agent. Proper pH 8.2 will lower or raise the pH until 8.2 is reached. pH will not rebound.

    Price From: USD 5.99

    Price From: USD 5.99

  • API Proper pH 7.5
    Proper pH 7.5 neutralizes chlorine, detoxifies heavy metals, and adds electrolytes to the aquarium. Contains Aloe Vera, a proven natural stress reducer and healing agent. Proper pH 7.5 will lower or raise the pH until 7.5 is reached. pH will not rebound.

    Price From: USD 6.49

    Price From: USD 6.49

  • API pH Down
    Lowers pH and makes aquariums more acidic. Fast-acting, colorless and easy-to-use.

    Price From: USD 2.99

    Price From: USD 2.99

  • Seachem Replenish
    Replenish is a proprietary blend of salts designed to replenish physiologically relevant minerals that are removed by reverse osmosis or deionizing filtration.

    Price From: USD 4.40

    Price From: USD 4.40

  • Seachem Safe
    • Complete and concentrated dry conditioner
    • Quickly and effectively removes chlorine and chloramine
    • Convert ammonia into a safe, non-toxic form
    • Use at start-up and whenever adding or replacing water
    • Great for both freshwater and saltwater applications

    Price From: USD 10.99

    Price From: USD 10.99

  • Seachem Reef Calcium
    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).

    Price From: USD 9.98

    Price From: USD 9.98

  • Seachem Reef Complete
    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.

    Price From: USD 6.50

    Price From: USD 6.50

  • Red Sea Reef Colors - D (Bioactive Minerals) - 1.32 gal
    • Complete range of complementary major, minor, and trace element complexes
    • Contains halogens associated with the purple/blue pigments of the soft tissues of corals
    • Make sure to only dose according to a measured requirement of the aquarium

    Regular Price: USD 69.99

    Sale Price USD 59.99

    Regular Price: USD 69.99

    Sale Price USD 59.99

  • Red Sea Reef Energy A (Concentrated Energy Source) - 1.32 gal
    • Contains a blend of carbohydrates in a readily accessible format for corals
    • Grows parallel to the energy provided by symbiotic zooanthealle algae
    • Ingredients of Energy A should be used in conjunction with Reef Energy B
    USD 99.99
    USD 99.99
  • Red Sea Reef Foundation Supplement - A (Ca/Sr) - 1.32 gal
    • Foundation A is a part of the Red Sea's Complete Reef Care system
    • 1 ml of A will raise the Calcium level of 25 gallons of water by 2 ppm
    • Each Foundation has a convenient measuring cup for simple dosing
    USD 84.99
    USD 84.99
  • 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 84.99
    USD 84.99
  • Red Sea Reef Foundation Supplement - C (Mg) - 1.32 gal
    • Foundation A is a part of the Red Sea's Complete Reef Care system
    • 1 ml raises the Magnesium level of 25 gallons of water by 1 ppm
    • Each Foundation has a convenient measuring cup for simple dosing
    USD 84.99
    USD 84.99
  • 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 12.73
    USD 12.73
  • 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 10.80
    USD 10.80
  • 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
    USD 75.60
    USD 75.60

    Out of stock

  • Red Sea Reef Colors - C (Iron/Trace) - 1.32 gal
    • Complete range of complementary major, minor, and trace element complexes
    • Contains halogens associated with the green/yellow pigments of the soft tissues of corals
    • Dose according to a measured uptake of Iron using Red Sea's Iron Pro test kit

    Regular Price: USD 74.99

    Sale Price USD 56.99

    Regular Price: USD 74.99

    Sale Price USD 56.99

    Out of stock

  • Seachem Prime - 1 L
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 23.72
    USD 23.72
  • API Quick Start
    Quick Start contains nitrifying bacteria to prevent new tank syndrome which also instantly starts the natural aquarium cycle to allow for instant addition of fish. Available in 1 oz, 4 oz, 8 oz, and 16 oz.

    Price From: USD 1.99

    Price From: USD 1.99

  • Kent Marine Nano-Reef Parts A & B - 8 fl oz
    • Specifically designed for small marine aquariums
    • Provides essential major, minor, and trace elements
    • Part B is an ionically-balanced buffer for stability

    Regular Price: USD 15.99

    Sale Price USD 7.99

    Regular Price: USD 15.99

    Sale Price USD 7.99

  • 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
    USD 9.20
    USD 9.20

    Out of stock

  • 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
    USD 41.58
    USD 41.58
  • API Proper pH 6.5
    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.

    Price From: USD 6.49

    Price From: USD 6.49

  • NutraFin Cycle Biological Aquarium Supplement
    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.

    Price From: USD 6.99

    Price From: USD 6.99

  • Kent Marine Essential Elements
    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.

    Price From: USD 5.49

    Price From: USD 5.49

  • Kent Marine Liquid Calcium
    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.

    Price From: USD 5.99

    Price From: USD 5.99

  • API Proper pH 7.0
    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.

    Price From: USD 6.49

    Price From: USD 6.49

  • Kent Marine Black Water Expert
    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.

    Price From: USD 4.99

    Price From: USD 4.99

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