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.
  • 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
  • Seachem Reef Trace - 500 ml
    Reef Trace supplies a broad range of trace elements demonstrated to be necessary for proper reef health and growth. It helps maintain an environment ideal for the growth and reproduction of marine life.
    USD 9.45
    USD 9.45
  • Seachem Discus Trace Liquid - 500 ml
    Discus Trace supplies a broad range of trace elements necessary for proper fish health and growth. It restores trace elements and minerals depleted by utilization, oxidation and precipitation. Does not contain sodium.
    USD 10.29
    USD 10.29
  • 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 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 Alkaline Buffer - 4 kg
    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 61.48
    USD 61.48
  • Seachem Equilibrium - 600 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 10.88
    USD 10.88
  • Seachem Neutral Regulator - 500 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 10.93
    USD 10.93
  • 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
  • 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 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 9.14
    USD 9.14
  • Seachem Reef Advantage Magnesium - 600 g
    Reef Advantage Magnesium is a concentrated (80,000ppm) optimized blend of magnesium chloride and sulfate salts, designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural seawater.
    USD 8.33
    USD 8.33
  • Seachem Cichlid Lake Salt - 250 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 6.05
    USD 6.05
  • 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 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
  • Seachem Stability - 100 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 3.52
    USD 3.52
  • 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
  • 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
  • Seachem Clarity - 500 ml
    The ultimate clarifier for both fresh and saltwater. Employs an advanced polymeric flocculating agent that is both reef and plant safe. Clarity will clear all types of clouding including, but not limited to, chemical clouding and particulate clouding.
    USD 13.52
    USD 13.52
  • Seachem Clarity - 250 ml
    The ultimate clarifier for both fresh and saltwater. Employs an advanced polymeric flocculating agent that is both reef and plant safe. Clarity will clear all types of clouding including, but not limited to, chemical clouding and particulate clouding.
    USD 7.13
    USD 7.13
  • 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 Malawi/Victoria Buffer - 600 g
    Malawi / Victoria is a blend of carbonate salts designed to enhance the natural environment of cichlids by increasing hardness, buffer capacity, and pH. Formulated to maintain a pH of 7.8 - 8.4. Use when setting up new aquariums or doing water changes.
    USD 10.29
    USD 10.29
  • Seachem Betta Basics - 60 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 2.08
    USD 2.08
  • Seachem Replenish - 4L
    Replenish is a proprietary blend of salts designed to replenish physiologically relevant minerals that are removed by reverse osmosis or deionizing filtration.
    USD 24.69
    USD 24.69
  • 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 Reef Fusion 1 - 1 L
    Reef Fusion 1 provides not only 100,000 mg/L of ionic calcium, but also includes biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum.
    USD 11.56
    USD 11.56
  • Seachem Reef Fusion 1 - 2 L
    Reef Fusion 1 provides not only 100,000 mg/L of ionic calcium, but also includes biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum.
    USD 17.34
    USD 17.34
  • Seachem Reef Fusion 1 - 4 L
    Reef Fusion 1 provides not only 100,000 mg/L of ionic calcium, but also includes biologically appropriate levels of magnesium, strontium, boron, iron, manganese, and molybdenum.
    USD 26.11
    USD 26.11
  • Seachem Reef Fusion 2 - 500 ml
    Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.
    USD 7.22
    USD 7.22
  • Seachem Reef Fusion 2 - 1 L
    Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.
    USD 11.56
    USD 11.56
  • Seachem Reef Fusion 2 - 2 L
    Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.
    USD 17.34
    USD 17.34
  • Seachem Reef Fusion 2 - 4 L
    Reef Fusion 2 contains a mixture of carbonates and bicarbonates at an alkalinity of 4400 meq/L. It is designed to restore and maintain alkalinity in the reef aquarium and provide calcareous species with the essential carbonate needed for growth.
    USD 26.11
    USD 26.11
  • 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 Clarity - 100 ml
    The ultimate clarifier for both fresh and saltwater. Employs an advanced polymeric flocculating agent that is both reef and plant safe. Clarity will clear all types of clouding including, but not limited to, chemical clouding and particulate clouding.
    USD 3.52
    USD 3.52
  • Two Little Fishies BioPronto Marine - 250 ml
    • Contains cultured, naturally occuring microbes
    • Rapidly starts biological filtration process in marine aquariums
    • Helps initiate the nitrification cycle in new aquariums
    • Enhances nitrification/denitrification in heavily stocked aquariums
    • Made in the U.S.A.

    Regular Price: USD 18.54

    Sale Price USD 12.99

    Regular Price: USD 18.54

    Sale Price USD 12.99

  • Two Little Fishies BioPronto Marine - 500 ml
    • Contains cultured, naturally occuring microbes
    • Rapidly starts biological filtration process in marine aquariums
    • Helps initiate the nitrification cycle in new aquariums
    • Enhances nitrification/denitrification in heavily stocked aquariums
    • Made in the U.S.A.

    Regular Price: USD 29.33

    Sale Price USD 19.99

    Regular Price: USD 29.33

    Sale Price USD 19.99

  • 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

  • API Stress Coat+ - 4 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 4.99

    Sale Price USD 3.99

    Regular Price: USD 4.99

    Sale Price USD 3.99

  • Aquarium Conditioner - 4 fl oz
    • Removes EPA maximum chlorine up to 4.5ppm & EPA maximum copper up to 1.3ppm
    • This conditioner has formaldehyde, synthetic PVP and ineffective aloe free ingredients
    • Super great for reducing inflammation and has a natural algae-based slime protector
    • Immune booster helps fight against virus, bacteria, fungi, parasites and heals wounds
    • Perfect for use during stressful transportation or cleaning and promotes overall health
    USD 3.49
    USD 3.49
  • Aquarium Conditioner - 8 fl oz
    • Removes EPA maximum chlorine up to 4.5ppm & EPA maximum copper up to 1.3ppm
    • This conditioner has formaldehyde, synthetic PVP and ineffective aloe free ingredients
    • Super great for reducing inflammation and has a natural algae-based slime protector
    • Immune booster helps fight against virus, bacteria, fungi, parasites and heals wounds
    • Perfect for use during stressful transportation or cleaning and promotes overall health
    USD 5.49
    USD 5.49
  • 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
    USD 5.49
    USD 5.49
  • API Stress Coat+ - 16 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 6.99

    Sale Price USD 5.99

    Regular Price: USD 6.99

    Sale Price USD 5.99

  • API Ammo Lock - 4 fl oz
    Works instantly, in both fresh and saltwater, to detoxify ammonia and remove chlorine and chloramines. Locks up ammonia in a non-toxic form until it can be broken down by the tank's natural biological filter.

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • API Ammo Lock - 8 fl oz
    Works instantly, in both fresh and saltwater, to detoxify ammonia and remove chlorine and chloramines. Locks up ammonia in a non-toxic form until it can be broken down by the tank's natural biological filter.

    Regular Price: USD 6.99

    Sale Price USD 5.49

    Regular Price: USD 6.99

    Sale Price USD 5.49

  • API Ammo Lock - 16 fl oz
    Works instantly, in both fresh and saltwater, to detoxify ammonia and remove chlorine and chloramines. Locks up ammonia in a non-toxic form until it can be broken down by the tank's natural biological filter.

    Regular Price: USD 9.99

    Sale Price USD 7.99

    Regular Price: USD 9.99

    Sale Price USD 7.99

  • API Accu-Clear - 1.25 fl oz
    Clarifies hazy aquarium water fast, eliminating clouding brought about by suspended particles. Clumps tiny floating particles together, forming large particles to be removed by the aquarium filter. Eliminates milky haze caused by gravel in new aquariums.

    Regular Price: USD 3.99

    Sale Price USD 2.99

    Regular Price: USD 3.99

    Sale Price USD 2.99

  • Red Sea Reef Foundation Supplement - A (Ca/Sr) - 500 ml
    • Foundation A is apart 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 14.99
    USD 14.99
  • Red Sea Reef Foundation Supplement - B (Alk) - 500 ml
    • Foundation B is apart 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 14.99
    USD 14.99
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