Additives

Items 1 to 48 of 281 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 - 500 ml
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 12.02
    USD 12.02
  • Big Al's Multi-Purpose Water Conditioner - 64 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.

    Regular Price: USD 16.99

    Special Price USD 9.99

    Regular Price: USD 16.99

    Special Price USD 9.99

  • Seachem Stability - 500 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 13.52
    USD 13.52
  • Big Al's Multi-Purpose Bio-Clean - 64 fl oz
    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.

    Regular Price: USD 24.99

    Special Price USD 21.99

    Regular Price: USD 24.99

    Special Price USD 21.99

  • Seachem Pristine - 500 ml
    • Uses non-chemical bio-augmentation to improve water quality
    • Provides bacteria that break down excess food, water, and detritus
    • Reduces excess nutrients (e.g. ammonia, nitrates, and nitrites)
    • Increases water clarity and promotes overall system health
    • Great for use in both freshwater and saltwater aquariums
    USD 15.55
    USD 15.55
  • Seachem Prime - 2 L
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 46.41
    USD 46.41
  • Big Al's Multi-Purpose Bio-Support - 64 fl oz
    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.

    Regular Price: USD 24.99

    Special Price USD 16.99

    Regular Price: USD 24.99

    Special Price USD 16.99

  • 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

    Special Price USD 6.99

    Regular Price: USD 8.99

    Special Price USD 6.99

  • API Tap Water Conditioner - 16 fl oz
    • Super-strength water conditioner
    • Instantly removes chlorine and detoxifies heavy metals
    • Each gallon of tap water only requires a single drop!
    • Safe for all aquatic life
    • Use when setting up a new aquarium or when adding water

    Regular Price: USD 5.99

    Special Price USD 4.99

    Regular Price: USD 5.99

    Special Price USD 4.99

  • Seachem Cichlid Trace - 500ml
    Cichlid Trace supplies a broad range of trace elements demonstrated to be necessary for proper fish health and growth. Restores trace elements depleted by utilization, oxidation and precipitation. Only contains elements required by fish.
    USD 9.14
    USD 9.14
  • API Stress Coat+ - 64 fl oz
    • Patented formula contains aloe vera - nature's liquid bandage
    • Forms a synthetic slime coating on the skin of fish
    • Replaces natural slime lost by handling, shipping, stress, etc.
    • Removes ammonia, chlorine, and chloramines instantly
    • Also neutralizes heavy metals

    Regular Price: USD 22.99

    Special Price USD 17.99

    Regular Price: USD 22.99

    Special Price USD 17.99

  • API Stress Zyme+ - 16 fl oz
    Improves the development of the biological filter and helps clean a dirty aquarium. Breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels. Safe for fresh and saltwater aquariums.

    Regular Price: USD 9.99

    Special Price USD 8.99

    Regular Price: USD 9.99

    Special Price USD 8.99

  • ATM Outbreak! Freshwater Premium Biological Maintenance - 8 fl oz
    • 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.

    Regular Price: USD 7.99

    Special Price USD 4.99

    Regular Price: USD 7.99

    Special Price USD 4.99

  • API Stress Zyme+ - 1 gal
    Improves the development of the biological filter and helps clean a dirty aquarium. Breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels. Safe for fresh and saltwater aquariums.

    Regular Price: USD 44.99

    Special Price USD 39.99

    Regular Price: USD 44.99

    Special Price USD 39.99

  • Seachem Safe - 250 g
    • 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
    USD 10.09
    USD 10.09
  • 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

    Special Price USD 6.99

    Regular Price: USD 7.99

    Special Price USD 6.99

  • Seachem Fresh Trace - 500 ml
    A broad range of trace elements necessary for proper fish health and growth. Unlike terrestrial animals, fish obtain nutrients from both their food and environment. Restores trace elements depleted by utilization, oxidation and precipitation.
    USD 9.14
    USD 9.14
  • 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

    Special Price USD 9.89

    Regular Price: USD 10.99

    Special Price USD 9.89

  • 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

    Special Price USD 5.99

    Regular Price: USD 7.49

    Special Price USD 5.99

  • Kent Marine Strontium & Molybdenum - 16 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 10.99

    Special Price USD 9.49

    Regular Price: USD 10.99

    Special Price USD 9.49

  • Seachem Cichlid Lake Salt - 1 kg
    A chemically sound blend of salts designed to replicate the natural environment of Cichlids. Contains all physiologically essential elements such as magnesium, calcium, sodium, potassium, and includes trace components such as iron, aluminum, and iodide.
    USD 18.15
    USD 18.15
  • Seachem Cichlid Lake Salt - 500 g
    A chemically sound blend of salts designed to replicate the natural environment of Cichlids. Contains all physiologically essential elements such as magnesium, calcium, sodium, potassium, and includes trace components such as iron, aluminum, and iodide.
    USD 10.29
    USD 10.29
  • Seachem Replenish - 500ml
    Replenish is a proprietary blend of salts designed to replenish physiologically relevant minerals that are removed by reverse osmosis or deionizing filtration.
    USD 4.04
    USD 4.04
  • Seachem Stability - 2 L
    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 42.84
    USD 42.84
  • API Algaefix Marine - 16 fl oz
    Reef-safe aquarium algaecide. Controls many types of algae in marine and reef aquariums. Will not harm coralline algae. Effectively controls Green algae, "Red Slime" and "Brown algae" in marine aquariums containing live corals, invertebrates and fish.

    Regular Price: USD 11.99

    Special Price USD 9.99

    Regular Price: USD 11.99

    Special Price USD 9.99

  • 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

    Special Price USD 5.99

    Regular Price: USD 6.99

    Special Price USD 5.99

  • Big Al's Multi-Purpose Water Conditioner - 4 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.

    Regular Price: USD 2.69

    Special Price USD 1.99

    Regular Price: USD 2.69

    Special Price USD 1.99

  • Hikari Ultimate - 16 fl oz
    • Destroys Chloramines
    • Removes Ammonia
    • Removes Chlorine
    • Detoxifies Nitrite
    • Detoxifies Heavy Metals (including Copper)
    USD 9.49
    USD 9.49
  • Seachem Alkaline Buffer - 600 g
    Alkaline Buffer is a non-phosphate buffer designed to raise pH and alkalinity (KH). Designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Raises pH and buffers between 7.2 and 8.5.
    USD 10.66
    USD 10.66
  • Seachem Equilibrium - 300 g
    Equilibrium is specifically designed to establish the ideal mineral content for the planted aquarium. Equilibrium is ideally suited for use with RO (reverse osmosis) or DI (deionized) water or any mineral deficient water.
    USD 6.30
    USD 6.30
  • Seachem Prime - 4 L
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 79.24
    USD 79.24
  • Seachem Pristine - 250 ml
    • Uses non-chemical bio-augmentation to improve water quality
    • Provides bacteria that break down excess food, water, and detritus
    • Reduces excess nutrients (e.g. ammonia, nitrates, and nitrites)
    • Increases water clarity and promotes overall system health
    • Great for use in both freshwater and saltwater aquariums
    USD 8.20
    USD 8.20
  • API Stress Zyme+ - 64 fl oz
    Improves the development of the biological filter and helps clean a dirty aquarium. Breaks down organic compounds that cause dangerous conditions such as ammonia and nitrite poisoning and low oxygen levels. Safe for fresh and saltwater aquariums.

    Regular Price: USD 34.99

    Special Price USD 24.99

    Regular Price: USD 34.99

    Special Price USD 24.99

  • API Tap Water Conditioner - 1 gal
    • Super-strength water conditioner
    • Instantly removes chlorine and detoxifies heavy metals
    • Each gallon of tap water only requires a single drop!
    • Safe for all aquatic life
    • Use when setting up a new aquarium or when adding water

    Regular Price: USD 29.99

    Special Price USD 24.99

    Regular Price: USD 29.99

    Special Price USD 24.99

  • Big Al's Multi-Purpose Bio-Support - 16 fl oz
    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.

    Regular Price: USD 8.99

    Special Price USD 6.99

    Regular Price: USD 8.99

    Special Price USD 6.99

  • Big Al's Multi-Purpose Water Conditioner - 16 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.

    Regular Price: USD 4.99

    Special Price USD 3.99

    Regular Price: USD 4.99

    Special Price USD 3.99

  • 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

    Special Price USD 49.99

    Regular Price: USD 67.99

    Special Price USD 49.99

  • Seachem Acid Buffer - 600 g
    Acid Buffer is a non-phosphate buffer to lower pH and buffer. It is designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Acid Buffer lowers pH and buffers between 5.0 and 8.0.
    USD 10.66
    USD 10.66
  • Seachem Stability - 250 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 7.13
    USD 7.13
  • 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

    Special Price USD 12.99

    Regular Price: USD 14.99

    Special Price USD 12.99

  • API Stress Coat Marine - 16 fl oz
    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.

    Regular Price: USD 8.69

    Special Price USD 6.99

    Regular Price: USD 8.69

    Special Price USD 6.99

  • ATM Colony Freshwater Professional Grade Nitrifying Bacteria - 32 fl oz
    • Instantly cycles aquariums with real nitrifying bacteria
    • Neutralizes ammonia and nitrite spikes naturally
    • Prevents and eliminates "New Tank Syndrome"
    • Made in the U.S.A.

    Regular Price: USD 16.99

    Special Price USD 11.99

    Regular Price: USD 16.99

    Special Price USD 11.99

  • ATM Colony Freshwater Professional Grade Nitrifying Bacteria - 8 fl oz
    • Instantly cycles aquariums with real nitrifying bacteria
    • Neutralizes ammonia and nitrite spikes naturally
    • Prevents and eliminates "New Tank Syndrome"
    • Made in the U.S.A.

    Regular Price: USD 7.99

    Special Price USD 5.99

    Regular Price: USD 7.99

    Special Price USD 5.99

  • Kent Marine Cichlid Buffer - 500 g
    Kent Marine Cichlid Buffer builds carbonate hardness, raises and stabilizes pH, and prevents pH drop. Works well with fish and plants whose native waters are hard and have a pH above 7.8. Phosphate and nitrate free.

    Regular Price: USD 8.99

    Special Price USD 7.99

    Regular Price: USD 8.99

    Special Price USD 7.99

  • Seachem Betta Basics - 250 ml
    Betta Basics is designed to provide the optimal environment for both betta and plant. Betta Basics removes any chlorine, chloramines, and ammonia. It buffers the water to a pH of 7.0 and promotes vigorous health and growth.
    USD 5.95
    USD 5.95
  • Seachem Neutral Regulator - 1 kg
    Seachem Neutral Regulator adjusts pH to neutral (pH 7.0) from either a low or high pH and maintains it there. It softens water by precipitating calcium and magnesium while removing chlorine, chloramine, and ammonia. Also stimulates slime coat production.
    USD 19.28
    USD 19.28
  • Seachem Neutral Regulator - 250 g
    Seachem Neutral Regulator adjusts pH to neutral (pH 7.0) from either a low or high pH and maintains it there. It softens water by precipitating calcium and magnesium while removing chlorine, chloramine, and ammonia. Also stimulates slime coat production.
    USD 6.44
    USD 6.44
  • Seachem Prime - 250 ml
    • Removes unwanted chlorine, chloramine
    • Detoxifies heavy metals, ammonia, and nitrite
    • Stimulates a healthy, natural slime coat
    USD 7.79
    USD 7.79
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