[Cichlidsrule]

Ok.
I have a thirty gallon tank with two skirt tetras, a swordtail, a mountain minnow, a lot of snails (working on that), a clown loach, and a rubbernose pleco.
The pleco was doing well (he had been introduced about a week or two ago), but recently, my mother (it's her tank) she said that she had found him about an hour ago with a big chunk taken out of his side-- so deep I could see the bone. I have no idea how this happened, as he isn't housed with any aggresive fish and the decorations are not so sharp as to slice him to the bone.
The only suspect I can think of his the clown loach, who is fairly young, not full grown yet. He was recently introduced to the tank a few days ago. But none of the clown loaches I've ever had were ever aggresive, and as far as I know, clowns as a general rule don't have a reputation for aggressiveness towards other fish...but I might be wrong.
I'll post a picture up ASAP, but in the meantime, is there anything I can do to save the poor pleco? If I seperate him and put him in a nice tank with some salt, will that do anything? Or will he die?
PLEASE help!D