Adding to the tank

[jassz]

Hello experts.

I currently have 135g FOWLR tank, with a 40g sump, a protein skimmer and a Fluval 404 canister filter. It's inhabitants are a large mellow lion fish (about a foot long), a wolf eel (about a foot and a half long) a picasso trigger (about 6 inches) and a little valentini puffer (fully grown, but the smallest of the group). Lately the tank has been taken over by aiptasia (sp?) anemone, which I wouldn't really mind as some of them are quite pretty, but I think they are bothering the fish a bit. I see what I think are sting marks periodically on all of them, but I am most worried about the trigger, who likes to park himself in the rocks at night but I think there are soon going to be no spots he can go. Maybe I worry too much. Anyway, I read that the auriga butterfly is good at removing the anemone, and I kind of wanted another fish anyway. Do you think this would be a good fit? None of them have particularily aggressive personalities.