Free Shipping in the US, from the US

Additives

The best way to keep your fish healthy is to keep your aquarium healthy. With these aquarium additives and regular aquarium maintenance, you can keep your water free of harmful chemicals and keep your fish safe and happy.

49 products
vibrant reef aquarim cleaner
Vibrant Liquid Aquarium Cleaner for Reef Tanks
$23.95
Thrive Specialty Liquid Fertilizer Thrive 500
Thrive Specialty Liquid Fertilizer Thrive 500
$22.95
Thrive SHRIMP S500 Specialty Liquid Fertilizer Thrive SHRIMP S 500
Thrive SHRIMP S500 Specialty Liquid Fertilizer Thrive SHRIMP S 500
$24.95
Thrive Complete + Specialty Liquid Fertilizer
Thrive Complete + Specialty Liquid Fertilizer
$23.95
Thrive Low Tech Specialty Liquid Fertilizer
Thrive Low Tech Specialty Liquid Fertilizer
$24.95
Vibrant Liquid Aquarium Cleaner for Freshwater Aquariums
Vibrant Liquid Aquarium Cleaner for Freshwater Aquariums
$24.95
Two Little Fishies PhosBan-L Liquid Instant Phosphate Binder
Two Little Fishies PhosBan-L Liquid Instant Phosphate Binder
$24.99
Ammonia poisoning is the most common killer of aquarium fish. Ammonia is produced by decomposing plants, algae, fish waste and uneaten food. Dangerous ammonia levels often occur in new aquariums or in an established tank when adding new livestock, when a filter stops working due to power or mechanical failure, or if existing beneficial bacterial colonies are lost due to the use of medications or sudden change in water conditions.
Fritz Aquatics Ammonia Remover for Aquarium, 4-Ounce
$12.95
ESV B-Ionic Calcium Buffer System
ESV B-Ionic Calcium Buffer System
$19.99
Boyd Enterprises Marine Vitachem for Aquarium
Boyd Enterprises Marine Vitachem for Aquarium
$12.95
ACP™ Bio Elements™ are essential minor components / elements / ions in natural sea water (NSW). ACP™ Bio Elements™ is a special concentrated formulation of important minor elements found in natural sea water (NSW).
Aqua Craft BIO-Elements 16 oz. #6
$19.95
Seachem Prime Water Conditioner is the complete and concentrated conditioner for both fresh and saltwater aquariums. Use during startup and water changes to eliminate and detoxify harmful chemicals in tap water and make your aquarium safe for fish.
Seachem Prime Water Conditioner
$15.75
Two Little Fishies Magnesium Concentrate
Two Little Fishies Magnesium Concentrate for Aquarium, 500ml
$14.95
Aqua Craft Iodide 16 oz. #8
Aqua Craft Iodide 16 oz. #8
$12.95
Fritz Aquatics Complete Water Conditioner, 4-Ounce
Fritz Aquatics Complete Water Conditioner, 4-Ounce
$7.95
CARIB SEA PurpleUp Corraline Algae Growth Accelerator for Aquariums
CARIB SEA PurpleUp Corraline Algae Growth Accelerator for Aquariums
$9.95
Aqua Craft Sr & Mo 16 oz.#9 (Strontium & Molybdate)
Aqua Craft Sr & Mo 16 oz.#9 (Strontium & Molybdate)
$11.95
Aqua Craft SEA TRACE 16 oz. #10
Aqua Craft SEA TRACE 16 oz. #10
$11.95
Aqua Craft Magnesium 16 oz. #3
Aqua Craft Magnesium 16 oz. #3
$14.95
Polyp Labs Plus 50ml - Coral Food and Minerals
Polyp Labs Plus 50ml - Coral Food and Minerals
$23.95
Two Little Fishies Calcium Concentrate for Aquarium
Two Little Fishies Calcium Concentrate for Aquarium, 500ml
$16.99
Thrive+ NilocG Aquatic 500ml All In One Liquid Fertilizer Aquarium Plants
Thrive+ NilocG Aquatic 500ml All In One Liquid Fertilizer Aquarium Plants
$24.95
ESV B-Ionic Strontium
ESV B-Ionic Strontium
$15.99
ESV-B-Ionic Magnesium
ESV-B-Ionic Magnesium
$19.95
E.S.V. Potassium Iodide Solution
E.S.V. Potassium Iodide Solution
$11.95
Thrive Caps NilocG Aquatics 60 Capsule All In One Fertilizer Aquarium Plants
Thrive Caps NilocG Aquatics 60 Capsule All In One Fertilizer Aquarium Plants
$16.50
Kent Marine Tech CB Part B
Kent Marine Tech CB Part B
$12.95
Kent Marine Phytoplex Aqua-cultured Phytoplankton
Kent Marine Phytoplex Aqua-cultured Phytoplankton
$14.95 Sold out
Aqua Craft Sulfate 16 oz. #4
Aqua Craft Sulfate 16 oz. #4
$12.95
Aqua Craft Professional Aquarium Treatment (P.A.T.)16 oz.
Aqua Craft Professional Aquarium Treatment (P.A.T.)16 oz.
$11.95
Aqua Craft Aquarium Plant Food 16oz (APF)
Aqua Craft Aquarium Plant Food 16oz (APF)
$13.95
Multiple forms of bio active & bio available high purity calcium.
Aqua Craft Aqua Cal 16 oz. #1
$19.95