Pink brittle star??

[salt newbie01]

I know we just talked about starfish at the last meeting but I don't remember if the pink brittle stars were ok or not. I know the green ones are bad but what about the pink brittles?? My LFS has got a couple in and I like the idea of something that moves in my rock work eating all the little stuff that can cause nitrate/nitrites. But I don't want to get it if it may eat my fish.

I added 2 small (1.5 inche) green chromis about a week ago. Would it be ok to add the brittle this weekend and then the yellow tang in another week or so. My LFS will hold the yellow tang for up to 2 weeks for me if I need him to. I don't want to add too much to the bioload too quickly. I didn't know if the brittle start would count as adding something to the bioload or not.

Thanks