Additives

Items 1 to 48 of 314 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.
  • 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
    USD 8.99
    USD 8.99
  • UltraLife Strontium Chloride Concentrate - 2.43 oz
    • Created with a 100% all natural and safe formula
    • Assists the growth and reproduction of stony corals
    • Keeps corals vivacity, size and healthy appearance
    • Betters your aquatic environment & experience
    USD 10.99
    USD 10.99
  • UltraLife Molybdenum Concentrate - 3.14 oz
    • Created with a 100% all natural and safe formula
    • Assists with the vitality of corals & clams
    • Betters your aquatic environment & experience
    USD 8.99
    USD 8.99
  • Kent Marine Tech M Magnesium - 1 gal
    Kent Marine Tech M Magnesium supplement is an ionically balanced product that safely raises the magnesium level in any marine system. Magnesium plays an important role in helping maintain the calcium concentration in reef aquaria.

    Regular Price: USD 34.99

    Sale Price USD 31.49

    Regular Price: USD 34.99

    Sale Price USD 31.49

  • Kent Marine Tech CB Part A - 64 fl oz
    Kent Marine Tech CB Part A & B is an ionically balanced, complete calcium and alkalinity control regimen for all marine aquariums. When A & B are used together they will raise both the calcium and buffer levels in the system.

    Regular Price: USD 11.99

    Sale Price USD 10.79

    Regular Price: USD 11.99

    Sale Price USD 10.79

  • Kent Marine Tech CB Part B - 64 fl oz
    Kent Marine Tech CB Part A & B is an ionically balanced, complete calcium and alkalinity control regimen for all marine aquariums. When A & B are used together they will raise both the calcium and buffer levels in the system.

    Regular Price: USD 11.99

    Sale Price USD 10.79

    Regular Price: USD 11.99

    Sale Price USD 10.79

  • 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 8.99

    Regular Price: USD 12.29

    Sale Price USD 8.99

  • 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 13.99

    Regular Price: USD 21.99

    Sale Price USD 13.99

  • 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 49.99

    Regular Price: USD 67.99

    Sale Price USD 49.99

  • NutraFin Aqua Plus Tap Water Conditioner - 8.45 fl oz
    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.

    Regular Price: USD 5.99

    Sale Price USD 4.49

    Regular Price: USD 5.99

    Sale Price USD 4.49

  • NutraFin Aqua Plus Tap Water Conditioner - 16.9 fl oz
    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.

    Regular Price: USD 8.99

    Sale Price USD 6.99

    Regular Price: USD 8.99

    Sale Price USD 6.99

  • NutraFin Aqua Plus Tap Water Conditioner - 2 L
    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.

    Regular Price: USD 24.99

    Sale Price USD 19.99

    Regular Price: USD 24.99

    Sale Price USD 19.99

  • NutraFin Waste Control Biological Aquarium Cleaner - 8.45 fl oz
    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.

    Regular Price: USD 8.99

    Sale Price USD 5.99

    Regular Price: USD 8.99

    Sale Price USD 5.99

  • NutraFin Waste Control Biological Aquarium Cleaner - 16.9 fl oz
    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.

    Regular Price: USD 19.99

    Sale Price USD 9.99

    Regular Price: USD 19.99

    Sale Price USD 9.99

  • NutraFin Waste Control Biological Aquarium Cleaner - 2 L
    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.

    Regular Price: USD 49.99

    Sale Price USD 39.99

    Regular Price: USD 49.99

    Sale Price USD 39.99

  • 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

  • Tetra AquaSafe Plus - 1.69 fl oz
    AquaSafe Plus works instantly to make tap water safe for fish. The patented PLUS BioExctract formula contains natural biopolymers and essential vitamins and minerals for healthy and clear water.

    Regular Price: USD 2.49

    Sale Price USD 1.99

    Regular Price: USD 2.49

    Sale Price USD 1.99

  • Tetra Easy Balance Plus - 16.9 fl oz
    • Carbonate Hardness additive
    • Stabilizes pH, prevents pH crash
    • Removes phosphate from aquarium water
    • Reduces nitrate with Nitraban

    Regular Price: USD 8.99

    Sale Price USD 6.99

    Regular Price: USD 8.99

    Sale Price USD 6.99

  • Tetra Easy Balance Plus - 8.45 fl oz
    • Carbonate Hardness additive
    • Stabilizes pH, prevents pH crash
    • Removes phosphate from aquarium water
    • Reduces nitrate with Nitraban

    Regular Price: USD 4.99

    Sale Price USD 3.99

    Regular Price: USD 4.99

    Sale Price USD 3.99

  • Tetra Easy Balance Plus - 3.38 fl oz
    • Carbonate Hardness additive
    • Stabilizes pH, prevents pH crash
    • Removes phosphate from aquarium water
    • Reduces nitrate with Nitraban

    Regular Price: USD 2.99

    Sale Price USD 2.49

    Regular Price: USD 2.99

    Sale Price USD 2.49

  • Tetra AquaSafe Plus - 33.8 fl oz
    AquaSafe Plus works instantly to make tap water safe for fish. The patented PLUS BioExctract formula contains natural biopolymers and essential vitamins and minerals for healthy and clear water.

    Regular Price: USD 14.99

    Sale Price USD 12.99

    Regular Price: USD 14.99

    Sale Price USD 12.99

  • Tetra AquaSafe Plus - 3.38 fl oz
    AquaSafe Plus works instantly to make tap water safe for fish. The patented PLUS BioExctract formula contains natural biopolymers and essential vitamins and minerals for healthy and clear water.

    Regular Price: USD 3.49

    Sale Price USD 2.99

    Regular Price: USD 3.49

    Sale Price USD 2.99

  • Tetra AquaSafe Plus - 8.45 fl oz
    AquaSafe Plus works instantly to make tap water safe for fish. The patented PLUS BioExctract formula contains natural biopolymers and essential vitamins and minerals for healthy and clear water.

    Regular Price: USD 3.99

    Sale Price USD 3.59

    Regular Price: USD 3.99

    Sale Price USD 3.59

  • Tetra AquaSafe Plus - 16.9 fl oz
    AquaSafe Plus works instantly to make tap water safe for fish. The patented PLUS BioExctract formula contains natural biopolymers and essential vitamins and minerals for healthy and clear water.

    Regular Price: USD 7.49

    Sale Price USD 6.49

    Regular Price: USD 7.49

    Sale Price USD 6.49

  • Kent Marine Purple Tech - 8.7 fl oz
    Kent Marine Purple Tech stimulates the growth of purple coralline and green calcareous macro-algae. It provides specific concentrations of calcium, magnesium, strontium, trace minerals and carbonates required by coralline algae and stony corals.

    Regular Price: USD 6.99

    Sale Price USD 5.99

    Regular Price: USD 6.99

    Sale Price USD 5.99

  • Kent Marine Purple Tech - 17.4 fl oz
    Kent Marine Purple Tech stimulates the growth of purple coralline and green calcareous macro-algae. It provides specific concentrations of calcium, magnesium, strontium, trace minerals and carbonates required by coralline algae and stony corals.

    Regular Price: USD 10.89

    Sale Price USD 8.99

    Regular Price: USD 10.89

    Sale Price USD 8.99

  • Kent Marine Pro Buffer dKH - 8 fl oz
    Kent Marine Pro Buffer dKH is an easy to use liquid formula that raises alkalinity and automatically controls pH in any marine aquarium. It is formulated to adjust pH of saltwater aquariums to between 8.0 and 8.3.

    Regular Price: USD 5.99

    Sale Price USD 5.39

    Regular Price: USD 5.99

    Sale Price USD 5.39

  • 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 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

  • 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

  • Kent Marine Discus Essential - 16 fl oz
    Kent Marine Discus Essential replaces important trace minerals found in lakes, streams, and rivers that are important to fish and plants and removed through chemical filtration. Can be used for all freshwater fish.

    Regular Price: USD 10.99

    Sale Price USD 9.89

    Regular Price: USD 10.99

    Sale Price USD 9.89

  • 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 9.89

    Regular Price: USD 10.99

    Sale Price USD 9.89

  • 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 9.44

    Regular Price: USD 10.49

    Sale Price USD 9.44

  • Kent Marine Pro Buffer dKH - 16 fl oz
    Kent Marine Pro Buffer dKH is an easy to use liquid formula that raises alkalinity and automatically controls pH in any marine aquarium. It is formulated to adjust pH of saltwater aquariums to between 8.0 and 8.3.

    Regular Price: USD 7.99

    Sale Price USD 6.99

    Regular Price: USD 7.99

    Sale Price USD 6.99

  • Kent Marine Pro Buffer dKH - 64 fl oz
    Kent Marine Pro Buffer dKH is an easy to use liquid formula that raises alkalinity and automatically controls pH in any marine aquarium. It is formulated to adjust pH of saltwater aquariums to between 8.0 and 8.3.

    Regular Price: USD 19.99

    Sale Price USD 17.99

    Regular Price: USD 19.99

    Sale Price USD 17.99

  • Kent Marine Pro-Clear Marine Clarifier - 8 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 5.99

    Sale Price USD 5.39

    Regular Price: USD 5.99

    Sale Price USD 5.39

  • 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

  • Kent Marine Iodide - 8 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 4.69

    Sale Price USD 3.99

    Regular Price: USD 4.69

    Sale Price USD 3.99

  • 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 6.99

    Regular Price: USD 7.79

    Sale Price USD 6.99

  • 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

  • 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
  • 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
    USD 19.99
    USD 19.99
  • 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
    USD 14.99
    USD 14.99
  • Two Little Fishies Kalkwasser - 4.4 lb
    • Pure source of Calcium Hydroxide
    • Replenishes calcium and maintains alkalinity
    • Benefits corals, clams, and calcareous algae
    • Helps maintain pH, precipitates phosphates, and enhances protein skimming

    Regular Price: USD 29.99

    Sale Price USD 25.99

    Regular Price: USD 29.99

    Sale Price USD 25.99

  • Seachem Stability - 50 ml
    Stability will rapidly and safely establish biofiltration in freshwater and marine systems. Contains a synergistic blend of aerobic, anaerobic, and facultative bacteria which facilitate the breakdown of waste organics, ammonia, nitrite and nitrate.
    USD 2.74
    USD 2.74
  • Kent Marine Coral Accel - 16 fl oz
    Kent Marine Coral Accel provides complex proteins and amino acids necessary to spur coral tissue growth. Ideal nutrition when fragmenting small polyped stony corals and propagating soft corals, octocorals, and colonial anemones.

    Regular Price: USD 12.99

    Sale Price USD 11.49

    Regular Price: USD 12.99

    Sale Price USD 11.49

  • Kent Marine Coral Accel - 8 fl oz
    Kent Marine Coral Accel provides complex proteins and amino acids necessary to spur coral tissue growth. Ideal nutrition when fragmenting small polyped stony corals and propagating soft corals, octocorals, and colonial anemones.

    Regular Price: USD 7.99

    Sale Price USD 6.99

    Regular Price: USD 7.99

    Sale Price USD 6.99

  • Kent Marine Coral Accel - 64 fl oz
    Kent Marine Coral Accel provides complex proteins and amino acids necessary to spur coral tissue growth. Ideal nutrition when fragmenting small polyped stony corals and propagating soft corals, octocorals, and colonial anemones.

    Regular Price: USD 34.99

    Sale Price USD 31.49

    Regular Price: USD 34.99

    Sale Price USD 31.49

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