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Owned and operated by fellow fish enthusiasts, Seachem has been providing hobbyists with education and support as well as trusted, scientifically proven saltwater and freshwater aquarium products for more than 40 years.
From Seachem Prime, the brand’s flagship water conditioner, to Seachem Stability, which helps prevent the number one cause of fish death, "new tank syndrome"—every product is backed by Seachem’s own staff of experienced chemists and biologists.
Petco proudly carries an extensive line of Seachem products, which are trusted by aquarists around the world to meet the needs of freshwater and saltwater aquariums, as well as reefs and ponds. Shop our wide selection of buffers, conditioners, filtration media, testing kits and more, many of which are completely unique and specific to Seachem:
Seachem Matrix is a unique, high-porosity biomedia for wet or wet/dry filters that have proven to be more effective than plastic biomaterials and will not break down or need to be replaced.
Seachem Purigen is a macro-porous synthetic polymer for freshwater and saltwater with the highest organic removal capacity among competing brands. Purigen darkens as it exhausts and can be easily renewed by treating it with bleach.
Developed for natural freshwater aquariums, Seachem Flourish contains a rich assortment of microelements, trace elements and other nutrients important to the health of aquatic plants.
Seachem products don’t just keep your aquarium healthy, they’re also designed to save you money through increased efficiency and concentration. Shop Petco’s Seachem solutions to find the best one for your aquarium today.
Learn how to safely handle your aquatic life to avoid toxin & bacterial exposure. Find aquatic life care supplies at your neighborhood Petco pet care center.
Updated on October 29th, 2025
Learn how to care for a Koi, recommended diet and aquarium setup. Find Koi for sale, supplies and equipment at your neighborhood Petco.
Updated on October 29th, 2025
Visit Petco to learn about cleanup crews and how they can help your aquarium health.
Updated on October 29th, 2025

When creating an outdoor fish pond you need the right environment, fish and maintenance to keep your water feature looking its best.
Updated on October 29th, 2025
Tanks with live plants can be excellent additions to your home, bringing a touch of nature indoors. Learn how to take care of aquatic plants.
Updated on October 29th, 2025
Without anything to use for scale, it is hard for me to tell how big your tank is, but in general it seems very small. Also, the water that is in the tank appears very cloudy right now, so that would be the first place to start. Water quality is very important, and will make or break your ability to house and care for fish. I would recommend getting a good filter system (you can visit a local pet store to assist you with brands in your area, as I am not familiar with what you can get in India). Be sure to bring the measurements (height, length, width) of your tank, or the gallons or liters so they can tell you what capacity of filter you will need. Everything else will depend on what types of fish you get - if you plan on getting multiple fish, they will need to be small - a general rule of thumb is one square inch of fish per gallon of water. Depending on the species you get, you may need to also get a bubbler to ensure there is enough oxygen in the water for them, and you will also
Updated on August 12th, 2025
Check the water chemistry. Confirm ammonia and nitrite levels are 0.25ppm or less and nitrates are 40ppm or less. Use a liquid test kit or submit a sample for testing. Most pet stores or aquarists will do this for free or for a small fee. Partial water changes, about 30% can be done to decrease high levels. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. My preferences for water conditioning are AmQuel Plus and NovAqua in addition to StressCoat. Confirm water temperature between 78F and 80F. You can soak pellets in some garlic juice to stimulate his appetite.
Updated on August 12th, 2025
You can try feeding them commercial fish food or meal works from your local pet store. If you would like a consult, you can provide pictures and we can give you a better idea of what kinds of fish they are and if they have special requirements for their diet. Hope this helps!
Updated on August 12th, 2025
Pimafix is an acceptable "natural" antifungal treatment. Melafix is for bacterial infections. Kanamycin, erythromycin or metronidazole are good broad spectrum antibiotics. Fungus Cure (by API) is an excellent antifungal. You can find these medications in the aquarium section of most pet stores or even online. Follow label directions carefully and remove the carbon filter insert during treatment if indicated. The cornerstone of any treatment is to first maintain pristine water quality and stable chemistry.
Updated on August 12th, 2025
Check the water chemistry first. Use a home test kit or submit a water sample for testing. The local pet store or fish store may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with a nitrate level of 20 ppm or less. Perform partial water changes as needed to stabilize chemistry and/or to improve water quality. Use only conditioned water that is temperature matched to prevent stress or shock. These fish produce a larger than average bio-load (wastes), so strong filtration is a necessity. The filter should be rated for at least twice the volume of the tank. The size of the tank may also be an issue. When keeping koi, tanks or ponds in the hundreds (or even thousands) of gallons are common. The number of fish in the current tank is too high. Consider getting multiple tanks or a significantly larger tank. 9 goldfish would need at least a 100 gallon tank. The additional koi increases this number.
Updated on August 12th, 2025