Got this guy about a month and half ago. He initially stayed put for the first month but moved during the middle of the night, woke up and found him sitting up against the back glass with little pink tips all over the tank. I suspect he went up to check out the powerhead and got chewed up. He used to be really uniform, now hes missing half of his tentacles. He then moved from there to underneath the rock where I originally had him (which is also my perculas cave) and hid until today. I feed him daily small amounts of mysis and he seems to have a decent appetite. Should I just ride this out or should I remove him to treat him? Any recommendations? His mouth is open and I've read that is a very bad thing.