my brittles, brown and stupid green, eat shrimp, seaweed, whatever raw seafood I feed them. When sinner gets a seafood package (with raw unseasoned stuff), I steal a few pieces for the stars.
CC love to knock snails off the glass and eat them...saw my old one do this many times.
Some brittles, especially the greens, are known to eat fish.
If a green is kept well fed, will he still try to eat a fish. swf.com sent me a green brittle last year, I thought I was getting a brown like I did last time...I don't have any fish but don't want to wait till the green dies before I can get fish...(don't have lfs that I'd trust to give the star too, and I'm not sending him to certain doom).
CC star will pass up seaweed for shrimp...I once gave him seaweed , then a little while later gave him shrimp (just to see what he'd do) and he past the seaweed out.
I feed stars (all three, green brittle, serpent and cc) shrimp about once a week, cc gets fee seaweed whenever he comes to the top front glass, every few days or so (I don't have any algea in the tank for him to eat).
I had a clam...that died...but I never saw the cc or other stars near him.
I never saw (note I said I never saw, that doesn't mean they didn't...I've had many crabs disappear over the years) my stars eat fish or inverts that were alive, other than the cc eating snails. The serpent ate a CBS shrimp once, (after the CBS ate ten peppermint shrimp) but I'm not sure if it was already dead or not.