Additives

Items 97 to 144 of 458 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.
  • Kordon NovAqua - 8 fl oz

    Regular Price: USD 6.99

    Sale Price USD 4.91

    Regular Price: USD 6.99

    Sale Price USD 4.91

  • Kordon NovAqua - 1 gal

    Regular Price: USD 60.99

    Sale Price USD 49.99

    Regular Price: USD 60.99

    Sale Price USD 49.99

  • Kordon NovAqua - 16 fl oz
    Description Coming Soon!
    USD 10.99
    USD 10.99
  • 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
  • Python Multi-Purpose Water Conditioner - 4 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
    • 4 fl oz of solution treats 240 U.S. gal of aquarium water
    • Part 1 of the Python three step water treatment system
    USD 1.99
    USD 1.99
  • Python Multi-Purpose Water Conditioner - 16.2 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
    • 16.2 fl oz of solution treats 960 U.S. gal of aquarium water
    • Part 1 of the Python three step water treatment system
    USD 3.99
    USD 3.99
  • Python Multi-Purpose Water Conditioner - 1 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
    • 1 fl oz of solution treats 60 U.S. gal of aquarium water
    • Part 1 of the Python three step water treatment system
    USD 0.99
    USD 0.99
  • Python Multi-Purpose Bio-Support - 67.6 fl oz
    • Jump-starts aquarium filters with live beneficial bacteria
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 67.6 fl oz of solution treats 4.000 U.S. gal of aquarium water
    • Part 2 of the Python three step water treatment system
    USD 31.99
    USD 31.99
  • Python Multi-Purpose Bio-Support - 4 fl oz
    • Jump-starts aquarium filters with live beneficial bacteria
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 4 fl oz of solution treats 240 U.S. gal of aquarium water
    • Part 2 of the Python three step water treatment system
    USD 3.49
    USD 3.49
  • Python Multi-Purpose Bio-Support - 16.2 fl oz
    • Jump-starts aquarium filters with live beneficial bacteria
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 16.2 fl oz of solution treats 960 U.S. gal of aquarium water
    • Part 2 of the Python three step water treatment system
    USD 9.49
    USD 9.49
  • Python Multi-Purpose Bio-Support - 1 fl oz
    • Jump-starts aquarium filters with live beneficial bacteria
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 1 fl oz of solution treats 60 U.S. gal of aquarium water
    • Part 2 of the Python three step water treatment system
    USD 1.49
    USD 1.49
  • Python Multi-Purpose Bio-Clean - 67.6 fl oz
    • Breaks down organic waste in aquarium water
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 67.6 fl oz of solution treats 4.000 U.S. gal of aquarium water
    • Part 3 of the Python three step water treatment system
    USD 30.99
    USD 30.99
  • Python Multi-Purpose Bio-Clean - 4 fl oz
    • Breaks down organic waste in aquarium water
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 4 fl oz of solution treats 240 U.S. gal of aquarium water
    • Part 3 of the Python three step water treatment system
    USD 3.49
    USD 3.49
  • Python Multi-Purpose Bio-Clean - 16.2 fl oz
    • Breaks down organic waste in aquarium water
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 16.2 fl oz of solution treats 960 U.S. gal of aquarium water
    • Part 3 of the Python three step water treatment system
    USD 10.49
    USD 10.49
  • Python Multi-Purpose Bio-Clean - 1 fl oz
    • Breaks down organic waste in aquarium water
    • Designed for use with freshwater and marine aquariums
    • Made safe for use with fish, invertebrates, and plants
    • 1 fl oz of solution treats 60 U.S. gal of aquarium water
    • Part 3 of the Python three step water treatment system
    USD 1.49
    USD 1.49
  • 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
  • Kordon Amquel - 16 fl oz
    • 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

    Regular Price: USD 7.99

    Sale Price USD 6.27

    Regular Price: USD 7.99

    Sale Price USD 6.27

  • Kordon Amquel - 8 fl oz
    • 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

    Regular Price: USD 5.99

    Sale Price USD 3.75

    Regular Price: USD 5.99

    Sale Price USD 3.75

  • 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

    Out of stock

  • 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
  • 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
  • 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
  • Acurel African Rift Lake Cichlid Salt - 5 lb
    • Allows Cichlids to easily thrive & reproduce
    • Promotes noticeably intense, vibrant color
    • Mimics the elements of their environment
    USD 22.49
    USD 22.49
  • 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
  • Acurel F Water Clarifier - 25 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

    Regular Price: USD 3.99

    Sale Price USD 2.98

    Regular Price: USD 3.99

    Sale Price USD 2.98

  • Kordon NovAqua Plus - 16 fl oz
    • NovAqua+ Is A Best Quality Water Conditioner For All Water Sources
    • NovAqua+ Removes Heavy Metals From Tap Water
    • NovAqua+ Dismantles Chloramines InTap Water
    • NovAqua+ Removes All Chlorine From Tap Water
    • NovAqua+ Provides Health Aids, Including Immunizers and Vitamins To Fishes

    Regular Price: USD 6.99

    Sale Price USD 6.49

    Regular Price: USD 6.99

    Sale Price USD 6.49

  • Kordon NovAqua Plus - 1 gal
    • NovAqua+ Is A Best Quality Water Conditioner For All Water Sources
    • NovAqua+ Removes Heavy Metals From Tap Water
    • NovAqua+ Dismantles Chloramines InTap Water
    • NovAqua+ Removes All Chlorine From Tap Water
    • NovAqua+ Provides Health Aids, Including Immunizers and Vitamins To Fishes

    Regular Price: USD 39.99

    Sale Price USD 37.99

    Regular Price: USD 39.99

    Sale Price USD 37.99

  • Kordon Fish Protector - 4 fl oz
    A professional quality water treatment that calms fish, minimizes infection and aids healing - thereby helping to protect fishes during handling, illness and transportation. Fish Protector detoxifies heavy metals present in public water supplies.
    USD 3.99
    USD 3.99
  • Kordon Fish Protector - 16 fl oz
    • 16 ounces treats 2,400 gallons.
    • Heals Missing Scales & Bruises
    • Adds Multi-Layer Slime Coat
    • Helps Minimize Infections
    • Calms Fishes, Eases Stress

    Regular Price: USD 6.49

    Sale Price USD 5.39

    Regular Price: USD 6.49

    Sale Price USD 5.39

  • Kordon Amquel Plus - 8 fl oz
    • 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 4.49
    USD 4.49
  • Kordon Amquel Plus - 4 fl oz
    Safely detoxifies natural nitrogen compounds in the water, including nitrites and nitrates that before could not be effectively detoxified. Provides far better water conditions for fishes, aquatic invertebrates, and other life in fresh and salt water.

    Regular Price: USD 3.99

    Sale Price USD 3.70

    Regular Price: USD 3.99

    Sale Price USD 3.70

  • Kordon Amquel Plus - 16 fl oz
    • 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

    Regular Price: USD 10.99

    Sale Price USD 6.59

    Regular Price: USD 10.99

    Sale Price USD 6.59

  • 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

    Regular Price: USD 46.99

    Sale Price USD 35.98

    Regular Price: USD 46.99

    Sale Price USD 35.98

  • Seachem Reef Buffer - 20 kg
    Description Coming Soon!
    USD 236.52
    USD 236.52
  • Carib Sea PurpleUp
    Carib Sea 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 8.99

    Price From: USD 8.99

  • 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 7.99

    Price From: USD 7.99

  • 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

  • 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 1.99

    Price From: USD 1.99

  • 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 2.49

    Price From: USD 2.49

  • 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 2.99

    Price From: USD 2.99

  • 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 8.49

    Price From: USD 8.49

  • ATM Outbreak! Freshwater 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 3.99

    Price From: USD 3.99

  • 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 14.99

    Price From: USD 14.99

  • 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 5.39

    Price From: USD 5.39

  • 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 24.99

    Price From: USD 24.99

    Out of stock

  • 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 3.49

    Price From: USD 3.49

  • 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 3.49

    Price From: USD 3.49

  • 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 7.49

    Price From: USD 7.49

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