Boxer and Cleaner ?
my lfs calls the green brittle star the "green death" but at least with the brittle star is that they are easier to keep alive as they will eat prawns or baitfishThey are cool with starfish. I'd also second the notion to go for a brittle star. Ophiolepis superba is cool choice aka Banded brittlestar. I'd be carefull with Ophiolepis echinata(green brittlestar) as they tend to ensnare small fishes when they get bigger.
Very cool STAR. Any idea, his/her species