I have a 180g, lots of live rock, a mated pr of Benghaiis, now a 6 line wrasse( had 2), mandarin gobie and a Copperband butterfly. Lots of LPS and a seemingly ' activly engaged' pr of Percula Clowns. What I woulod like to know is- Could I possibly slip in another pair of clowns - say Oscillaris, Picasso?? (No Tomatoes or the other more agressive clowns. )