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Learn about hole in the head disease treatment for all fish. Petco is here to answer all your questions about Hexamita or hole in the head disease for fish.
Updated on October 23rd, 2025

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
Our top ten most important tips for removing and keeping algae out of your aquarium.
Updated on October 23rd, 2025
Acclimation helps your aquatic life adjust to the new chemistry of your tank, thereby helping ensure the health of your new addition.
Updated on October 23rd, 2025
Feeding your freshwater fish isn't as simple as adding a pinch of flakes! Read these three tips to learn more about how to provide your pets the nutrition and environment they need.
Updated on October 23rd, 2025
Fungal infections are usually due to poor water quality. Check the water chemistry, change or rinse filter media, perform a partial water change (use aged or conditioned water that is temperature matched to prevent shock) and treat with an antifungal until the condition clears. You can find an antifungal in the aquarium section of most pet stores. Follow label directions carefully.
Updated on September 24th, 2025
In this case you need a quite radical approach. 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
Im sorry for the loss of your fish. It could be, but without an exam it is difficult to say definitively. Some fungal or bacterial infections are contagious. Monitor the other fish for similar symptoms. Maintain pristine water quality and consider an "all-in-one" treatment if necessary. You can find these treatments in the aquarium section of the local Petco. Follow label directions carefully and remove the carbon filter insert during treatment if indicated.
Updated on September 24th, 2025
Without an image or exam it can be difficult to differentiate between fungal or bacterial infection vs a developing tumor. Continue treating with AQ salt. It may take a few more days before you begin to see improvement. If the fin rot is minor, you can use 1 tsp /gal of AQ salt. Severe rot can be treated with aquarium salt at 2tsp/gal. Keep the water temp between 76-768 F. Turn off the light and filter to inhibit bacterial growth and decrease water current. Use treated or "aged" water daily for the water changes. A home test kit should be used to confirm good quality water is being used each time. Treat with AQ salt for a maximum of 10 days. His behavior may be due to low water temps or a chemical imbalance.
Updated on September 24th, 2025
It may have been her slime coat coming off. The black color could have been caused by high ammonia levels. It can cause "burns" which will discolor scales. In the future, it is best to perform 30-50% water changes daily to balance chemistry and improve water quality. Use only aged or conditioned water that is temperature matched to prevent further stress or shock. Your filter should be rated to handle at least twice the water volume of the tank.
Updated on September 24th, 2025