What are these in my chaeto?

[Trooper182]

So cleaning up some chaeto and found a few things. I know there are brittle stars and they are beneficial. Wondering if I should keep some in the chaeto and put the others in the dt? And what are the others?

 

[exnisstech]

I can't remember what the little shell critter is called but I get them in my sump and they seem harmless. The other look like brittle stars. Mine are ussualy black tho. I consider them harmless as well. I read “stories “ of large ones eating fish but that's not going to happen in your sump. I think they're kinda cool so I put them back when I find them. I have put them. In the display but I never see them, again. They an hide in the smallest opening of rocks. Every once in a while I'll see a tentacle sticking out.

 

[exnisstech]

Deleted double post

 

[Bhor217]

micro brittle sea stars, they are good

 

[Tuan’s Reef]

I have a ton of these guys on my TBS live rock. Sadly my wrasses is making a huge dent in their rank.