long spine urchin and a brittle star

[gravismaximus]

getting a NON green brittle star for a cuc but would like to know if i could get a long spine urchin for algea. will they try to kill each other. also i already have a marble formina star will he be a meal for the brittle? i read some prey on other stars, (are they talking about grenn brittles?)

 

[blackjacktang]

hmm...I would think it would but im not shure. I know for a fact a chocolate chip star would.

 

[btldreef]

It's always a risk with brittle stars, what color is it?