I could never isolate him and quarantine him with Prazipro, though. He would not let me catch him. If you can isolate him, that might give him a chance.But mine never ate any of those things. It’s only a problem now because there is no algae in the tank for him to graze on. Maybe he does have a parasite though.
By the way, I also moved some algae from the sump to the DT just for him....wouldn't touch any of it but used to be a pig about it. :/