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Learn how to care for semi-aggressive fish, recommended diet & aquarium setup. Find the right food, supplies & equipment at your neighborhood Petco.
Updated on December 21st, 2025
GloFish are brilliantly colored and beautiful fish. Learn how to care for GloFish, what to feed them, how long they live, their ideal tank size and more.
Updated on October 23rd, 2025
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 October 23rd, 2025
Learn more about Killifish and their care to see if they are the right aquatic life to begin or add to your aquarium.
Updated on October 23rd, 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 23rd, 2025
This cloudiness is likely due to a bacterial bloom. This can happen if a tank is not properly cycled. Changing the water may make the condition worse. The fish could have been killed by elevated ammonia or nitrite levels. Use a home test kit or submit a water sample for testing. Most pet or fish stores will do this for free or for a nominal fee. If it is a new tank, allow it to properly cycle. This can take 4 or more weeks for the beneficial bacteria to populate the tank and filter. Once ammonia and nitrites are at 0.25 ppm (parts per million) or less and nitrates are at 40ppm or less, you can add fish. Goldfish are cold water fish and do best between 65 F and 72 F. They also need a larger aquarium than most fish. 20 gallons per fish plus an additional 10 gallons for each additional fish is recommended. They produce a larger than normal bio load which can quickly foul water, so a filter rated for at least twice the tank volume is strongly recommended as well.
Updated on September 24th, 2025
Thanks for reaching out. This problem is perplexing, but possibilities include fungal or bacterial overgrowths. A good cleaning might help to alleviate your problems. Continue to test water quality and correct problems. Sometimes the over-growth of anaerobic bacteria (those which grow in low or no oxygen conditions, at the bottom of the tank), can form strange formations of detritus. Submitting a sample to a lab might help determine an answer. Good luck.
Updated on September 24th, 2025
ECheck the water chemistry. The recent water change may have upset it. Use a liquid home test kit or submit a sample for testing to confirm 0 ppm ammonia and nitrites with a 40ppm or less nitrate level. Confirm proper temperature for the species of fish as well. If necessary, another partial water change can be done to stabilize chemistry and maintain water quality. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. My preferences for conditioners include AmQuel Plus, NovAqua and StressCoat. Other options include StressZyme and Prime. To manage swim bladder issues, withhold food for 2-3 days then feed bits of cooked and shelled green peas. Do this until the fish is swimming and defecating normally. Fast one day a week to maintain regularity.
Updated on September 24th, 2025
Thanks for reaching out about Corn and including photos. This could be mineral deposits but is difficult to tell in the photos. Mold usually does not grow below the water level as needs oxygen. Clean the filter well. A sample of the material can be acquired and a veterinarian might be able to help by examining under the microscope. Good luck.
Updated on September 24th, 2025
Check the water chemistry first. Elevated ammonia levels may result in a cloudiness to the eye(s). Use a master test kit (liquid, not strips) at home or submit a water sample for testing. Most pet stores will do this for free or for a small fee. Perform partial water changes daily, in indicated, to stabilize chemistry and maintain water quality. Use only aged/conditioned water that is temperature matched to prevent stress or shock. If chemistry is fine, it could be bacterial infection. A broad spectrum antibiotic, such as kanamycin, can be used for treatment. Look in the local pet store or Petco for "KanaPlex". It should be in the aquarium section. Follow label directions carefully and remove the carbon filter insert during treatment. Plain aquarium salt (NOT table or Epsom salt) can be used as a general tonic to reduce stress, improve gill function, treat minor infection and aid in recovery. Dissolve 1 teaspoon of salt per gallon of water in a cup of tank water and gently pour it
Updated on September 24th, 2025