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Related Articles & Questions

Health & Wellness
High Nitrates in Your Freshwater Fish Tank? Protect Fish & Prevent Deaths
Search Petco to find out the harm of high nitrates in freshwater fish aquariums. We provide vital information to help keep your fish happy & healthy.
Updated on June 19th, 2026
Health & Wellness
Is Your Aquarium Fish Sick? Spot & Treat Cotton Wool Disease Fast!
Cotton wool disease is a common ailment that affects aquarium fish. Learn more about the signs, symptoms and treatment solutions at Petco. 
Updated on June 19th, 2026
Care Sheets
Freshwater Community Fish: Care, Setup & Compatibility Guide
Learn how to care for freshwater community fish, recommended diet & aquarium setup. Find the right food, supplies & equipment at your neighborhood Petco.
Updated on April 9th, 2026
Care Sheets
Complete Ricefish Care: Setup, Diet, & Habitat for Thriving Fish
Learn more about these slow moving fish and the care they need when added to your aquatic environment.
Updated on April 9th, 2026
New Pet
Betta Fish Maintenance: Complete Care Guide
If you’re thinking of adding a betta fish to your family, learn a few fun facts about these underwater wonders.
Updated on July 17th, 2026
Health & Wellness
Why are my goldfish sick with fin rot and not improving after water changes?
Hi, and thanks for your question. This is a quite concerning presentation and it is likely to be related to water quality. Begin by submitting a water sample for quality testing. Most pet stores will do this for free or a nominal fee. Clinical examination should always include a water quality check, even if you have done so already. Water testing should be performed with a quality test kit, measuring NH4, NO2 and NO3. High ammonia levels, PH imbalances may be responsible for these signs. Oxygen concentration and quality of the filters should be determined as well. If water quality is good and there are no major imbalances, your fish should get examined to look for any sign of bacterial/fungal infection and eventually water should be treated. Hope this answer was helpful, but please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further. If this answer was helpful please let us know, this will be used to improve our service!
Updated on September 24th, 2025
Vet Q & A
Why are my fish gasping at the surface after cleaning the bowl?
Begin by submitting a water sample for quality testing. Most pet stores will do this for free or a nominal fee. High ammonia levels, PH imbalances may be responsible for that. Oxygen concentration and quality of the filters should be determined as well. Lack of oxygenation could be the cause of it. If water quality is good and there are no major imbalances, Bubbles should examined to look for any sign of bacterial/fungal infection and eventually water should be treated. Please do not hesitate to contact us again on the forum or by requesting a consultation (where you can post pictures ) if you have any more questions or to discuss it any further.
Updated on September 24th, 2025
Health & Wellness
My platy fish has white poop, is thin, and fins are off. What now?
Thanks for reaching out about your fish. Most of the water additives don't get absorbed systemically since fresh water fish do not drink water. A veterinary visit with a fecal sample is recommended to identify possible parasites and then prescribe a treatment. Most likely the medications needs to be top-coated on food and then eaten. Dosage depends on number of fish and estimated biomass (cumulative weight of fish). Good luck.
Updated on September 24th, 2025
Health & Wellness
My Oranda goldfish looks sick. What's wrong and how do I treat it?
Thanks for reaching out about your oranda. A picture would help in an attempt to identification. External parasites are numerous and a microscopic identification at a veterinary office might be needed. Sub-optimal water quality can irritate the skin, leading to mucous cell hypertrophy. Keep water quality pristine, a veterinary visit is needed to help further. Good luck.
Updated on September 24th, 2025
Health & Wellness
How to treat dirty tap water with iron for a healthy aquarium?
Some iron is necessary for a healthy aquarium, but too much can promote algae growth or impart an unsightly yellow or orange tinge to the water. Reverse osmosis (RO) filters are deal for removing mineral and heavy metals from water but they can be prohibitively expensive. Buying RO water from a local market or pet store is also a possibility but not economically feasible if you have a large tank. The best option may be a Polyfilter, which can be purchased in the local pet store or online. These filters will remove iron or other metals/chemicals and must be changed monthly or quarterly. You can also buy a water conditioner that will precipitate out some of the iron which can then be removed by mechanical filtration. An example of just one is Rid Metals (by Kordon). Follow label directions carefully, perform regular water changes and monitor iron levels with a home test kit or by submitting a water sample for testing.
Updated on September 24th, 2025