He is about 9" long and used to have what was either an anchorworm problem (pimples)or some type of parasite. He now has some white, cheesy type stuff hanging on to the inside of the gill. Occasionally, he will go crazy and start banging his left gill against anything. He also just stays in the back of the aquarium and hovers there. He's also lost most of his orange spots! Thanks if you can help him.