I don't think its your clowns causing the problems. I believe two firefish together, unless they are a mated pair, is not a good idea. Check it out this site http://www.fantasyreef.com/database/...d=7&item_id=36
65 gal reef
2 PC's 192W each , 20 gal sump/fuge
4 false clowns, 2 firefish, cardinal, midas blennie, toadstool, zoos, shrooms, trumpet coral, torch, pagoda, frogspawn, poylps, red open brain, devils hand, hermits, snails, 3 cleaner shrimp, coral banded and a emerald crab.