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Related Articles & Questions

Training & Behavior
Why Your Fish Pond Foams: Causes, Solutions for a Clear Pond
Foam buildup on your pond's surface can be an unsightly problem with multiple causes. Learn how good filtration, water changes, & water additives can help your pond foam problem on Petco Pet Education Center, formerly Petcoach.
Updated on June 19th, 2026
Care Sheets
Mastering Koi Care: Optimal Tank, Food, Water Quality & Health Tips
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 April 9th, 2026
New Pet
How to Take Care of Fish: Complete Beginner's Guide
Before establishing an aquarium at home, learn more about the basics of fish care.
Updated on June 19th, 2026
Care Sheets
Aquatic Pet Owners: Stop Invasive Species, Save Our Waterways
Read about Habitattitude and Petco's commitment to protect our environment. At Petco, animals always come first. Learn how you can help.
Updated on October 23rd, 2025
Care Sheets
Rainbow Fish Care: Tank, Food, & Compatibility for Thriving Pets
Learn how to care for Rainbow fish, recommended diet and aquarium setup. Find the right food, supplies and equipment at your neighborhood Petco.
Updated on April 9th, 2026
Health & Wellness
Why are my fish dying with pink and green algae in their tank?
Check the water chemistry using a home test kit or submit a water sample for testing. The local Petco may do this for free or for a small fee. Aim for an absence (0 ppm) of ammonia and nitrites with nitrates at 20ppm or less. Perform partial water changes to stabilize chemistry and/or to improve water quality. Rinse the filter media in tank water, not tap water, and replace it. Use only conditioned water that is temperature matched to prevent stress or shock. To limit algae growth, maintain pristine water quality via filtration and regular water changes. If possible, turn up filter flow to keep water moving. If this stresses the fish though, do not do it. Do not overfeed and remove any uneaten food promptly. Limit lighting to 8 hours daily and closely monitor water temperature as well. All these can promote algae overgrowth.
Updated on September 24th, 2025
Health & Wellness
Why are my fish still sick after velvet treatment, and tank has algae?
Thanks for reaching out. Have you tested water quality for pH, ammonia, nitrite and nitrate. Correct problems. Don't see any signs of external lesion on the pictures, except fine erosion, and possible gravid fish. A veterinary visit is probably needed to trouble shoot for disease. Randomly adding chemicals to the water could have detrimental effects. Good luck.
Updated on September 24th, 2025
Health & Wellness
My fish have growths, tattered fins, and are flashing. What's wrong?
Thanks for reaching out about your aquarium and including photos. Did you test your water quality prior to the water change? Continue to test for pH, ammonia, nitrites and nitrates. Pristine water quality is needed for health. Are any of the fish new, that could have introduced parasites? Itching/flashing can be due to water quality, external parasites, bacterial or viral infections and other causes. The white lesions on the photo could be fungal infections. A skin scrape and examination under the microscope (at a veterinarian's office) is needed for an attempt to determine a cause. Fungal infections are often secondary problems, so check water quality first. Good luck.
Updated on September 24th, 2025
Vet Q & A
Why is my fish's tail disappearing and tank getting brown algae?
It is likely fin rot which is caused by bacterial overgrowth. It may respond to treatment with simple aquarium salt. Place Alpha in a smaller tank, half gallon to one gallon, for easier treatment. Use 1-1.5 teaspoons per gallon. Perform a 100% water change each day and using a fresh water/salt solution. Do this for a maximum of 10 consecutive days. Strive for a water temp between 76 F and 78 F. This will inhibit bacterial growth. Turn off any tank light to further inhibit bacterial growth. Turn off the filter as the current may slow fin regrowth and the filter media may remove enough salt to affect treatment. This treatment should clear most cases of fin rot.
Updated on September 24th, 2025
Vet Q & A
My fish have white fuzz, aren't eating, and are lying down. What's up?
Thanks for reaching out about Fish. Test and correct water quality for pH, ammonia, nitrites and nitrates. If all fish are affected, water quality problems the most likely. Alteration can lead to increased mucous production from the skin (white stuff), but fungal dermatitis or parasites are also possible. A veterinary visit is recommended if the water quality if appropriate, to assess and provide a diagnostic/treatment plan. Good luck.
Updated on September 24th, 2025