I found a few unknown starfish

[reefgirl189]

Today I found a couple unknown species of starfish. They both look similar to the asterina species. The one which I would say looks most like asterina species is the smaller one, however it is very blue in colour. The only other ones in the tank before have been white in colour. The larger starfish is sandy coloured, and I have a feeling it might be a predator as he was munching on some coral when I saw him.

Can anyone ID?