My 20" silver seems to be a bit slugish his appetite not what it has been. He is eating though. It looks as if he has a bit of ich but its hard to tell on him. I can see small bumps on his head and a bit on his top fin. Then I just noticed it looks like he has some craters on his scales. I'm not sure if thats because maybe he has been scratching or it is some other disease. I Did a 20% water change increased water flow and added Melafix. Any other suggestions would be appreciated.