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Welcome to Petco’s saltwater fish store. Pet fish can make wonderful additions to your home and family. At Petco, saltwater marine fish for sale can be delivered to your home or purchased from our in-store Pet Care Center Aquatic Departments.
There you can find many kinds of Petco fish. Our pet fish types include beautiful Blue Hepatus Tang, Dog Face Puffers, Black Volitan Lionfish, Majestic Angel Fish and many other species. When you’re ready to order or pick up one of our saltwater aquarium fish for sale, you’ll want to be prepared with the appropriate home to welcome your pet fish.
Get set up with the appropriate aquariums, kits and stands, as well as fish feeding accessories. You’ll also want to make sure you have suitable aquarium water care supplies for aquarium maintenance.
You can discover many saltwater fish for sale in our fish pet store that can be great for either beginner aquarists or long-time fish pet parents. To make sure you’re adding an appropriate mix of fish into your community, check out our saltwater aquatic life compatibility chart.
Discover freshwater fish for sale at Petco for the right pet fish for your freshwater aquarium—including Petco betta fish.
Discover how to hardscape your aquarium here at Petco. Visit Petco and check out aquarium hardscape ideas, solutions and much more for your fish.
Updated on November 13th, 2025
Small Marine Fish are favorites with marine aquarists and includes a wide range of species.
Updated on November 13th, 2025
Discover the fish tank filter system that’s right for your aquarium. Learn about mechanical, chemical, and biological filtration at Petco.
Updated on November 13th, 2025
Learn how to take care of Large Marine Angelfish, recommended diet and tank setup. Find the right food, supplies and equipment at your neighborhood Petco.
Updated on November 13th, 2025
Learn how to care for a Damselfish, recommended diet and aquarium setup. Find Damselfish for sale, supplies and equipment at your neighborhood Petco.
Updated on November 13th, 2025
The experts here on the forum at Boop by Petco do not work at Petco stores and I don't think anyone would have knowledge of inventory at local stores. I cannot find this particular product on the Petco website. It's possible that it's available at your local store and you could try giving them a call. There are a number of other fatty acid supplements listed on the Petco website that may or may not be available in your local store: https://www.petco.com/shop/SearchDisplay?searchTermScope=&searchType=12&filterTerm=&maxPrice=&top_category=&showResultsPage=true&langId=-1&beginIndex=0&advancedSearch=&sType=SimpleSearch&metaData=%5BLjava.lang.String%3B%4065f965f9&pageSize=24&manufacturer=&resultCatEntryType=2&catalogId=10051&pageView=grid&searchTerm=fatty+acid&minPrice=&urlLangId=-1&categoryId=10056&storeId=10151
Updated on August 12th, 2025
Before you buy any fish, you will need to set up the tank. A basic set up includes: a tank, filter, hood/light, heater, gravel and some decor. The tank should run without fish for at least 4 to 6 weeks. This gives it time to cycle. The Nitrogen Cycle is critical to the health of the tank and any fish you will be keeping. During this time, beneficial bacterial will populate the filter and substrate (gravel). These bacteria will be responsible for breaking down fish wastes and other wastes (uneaten food, dead plants, etc.). You will need a home test kit to monitor water chemistry (ammonia, nitrites, nitrates, pH) or you will have to submit water samples for testing. Most pet stores will do this for free or for a small fee. At first, you will see high levels of ammonia and nitrites. Over time, as bacteria grow, these levels will drop. When ammonia and nitrites are at 0 ppm and nitrates are below 20 ppm, you can consider adding fish. Regular (every 1 or 2 weeks) partial water changes as we
Updated on August 12th, 2025
Anytime there is an unexpected loss of fish, water chemistry should be checked. Use a home test kit ( https://www.petco.com/shop/en/petcostore/product/api-freshwater-master-test-kit# ) or submit a water sample for testing. Most pet stores will do this for free or for a small fee. Confirm an absence ( 0 ppm ) of ammonia and nitrites with a nitrate level of 20 ppm. pH can range between 6.5 and 8, water temp should be 65 F to 75 F. If chemistry and water quality are within normal parameters, then illness or aggression would be other reasons for the loss. It is always recommended to quarantine fish in a separate tank for 2-4 weeks prior to adding them to the main tank. During this time, they can be treating for infection or parasites. I am sorry for the loss of your fish.
Updated on August 12th, 2025
Check the water chemistry first. Use a home test kit or submit a sample of water for testing. Most pet stores will do this for free or for a small fee for. High ammonia or nitrite levels can be toxic to fish. Aim for 0 ppm ammonia and nitrites with a nitrate level of 20ppm or less. Perform a partial water change, if indicated, to stabilize chemistry and maintain water quality. Use only aged or conditioned water that is temperature matched to prevent stress or shock. Check the water temperature as well, confirming it is appropriate for your species of fish.
Updated on August 12th, 2025
Thanks for reaching out about you fish. It is believed to be a Comet goldfish. Water quality and nutrition is the key to success. Testing water parameter for pH, ammonia, nitrite and nitrate will give you guidance for a healthy environment. Purchased food should be rotated out every 3 months as vitamin C and other nutrients degrade over time. Trying to maintain water temperature can be challenging with out a heater, but most fresh water fish tolerate some changes. Good luck.
Updated on August 12th, 2025