I have had two feeder goldfish for over a year now. Within the last 6 weeks I transferred them into a 5.5 gallon tank. Other than having issues keeping the tank clear they were doing fine. Approximately 3 weeks ago the led light when out in my tank but after about 2 weeks my husband was able to fix it. When he did I noticed a black spot on one of my fish. It then spread to the other fish. I did research and figured it was due to high ammonia levels and replaced most water and vacuumed the gravel, and rinsed the filter. They seemed to improve although not completely. Then within a few days the blackness spread on both fish. I recleaned the tank, put in a new filter and added an ammonia cleanser. It has not improved but has gotten worse. I’m very worried. I tried the ammonia cleanser again yesterday with no results. Can someone please help me save my fish?!
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