Kanaplex is readily absorbed through the skin, and doesn't need to be fed to remain effective.There are several injectable antibiotics available. Not sure which one to get. That will probably have to be my next step. There's one vet in the area that deals with fish. They come to you and start at $300 for a visit. Unfortunately, I don't have that kind of money at the moment. The Kanaplex says it can be fed. I may try that next. He's still active and eating well.