So I saw a piece of rock at the lfs
which caught my eye. It's the perfect rock, very long, pours and has it's own caves. Almost a foot long with about 7 inches of it being 3 inches thick. Now there is a quarter size opening on one end and the whole Rock is light. I believe the entire center is hollow.
I have never bought rock at this store before and when i brought the rock home I rinsed it in saltwater from a pwc
to see how hollow it was. By rinsing it about 5 mini brittle starfish fell out. My first reaction is that I didn't want them there and needed them out. Afterwards I placed the rock in my sump until I am ready to rearrange the rocks in my display tank.
Two days later I noticed the rock has many tubeworms on it, large bristleworms and many more mini brittle starfish. I am wondering what else is in that cave. My concern for now is only the brittle starfish as I plan to make this a reef tank with corals and inverts. Are these reef safe? Also there is a patch of reddish burgundy colored algae which I have never seen before. It seems fluffy or hairlike/ carpetlike.