need some IDs please

[czwicky]

Ok here are few pics of some things that I am not 100% sure what they are
The first pic is a tiny starfish. It has six legs and is about the size of a dime. I had a 6 legged red linkia star but I'm not sure if that's what this is.

Pictures 2-4 are of some weird blue spots on my LR. been there since I got the rock. I think it might be blue coralline but not sure. Hasn't seemed to grow/spread or do much of anything since I got my LR.

Picture 5 is a clam like thing. I think its a limpet because clams surviving a cycle is pretty much unheard of but again not sure.

Pictures 6-8 are a black thing I've seen developing on one of my mushroom frag rocks. I think it may be some type of sponge

Thanks ahead of time guys!(and gals)

 

[Beengirl]

The star is an asterina star. Harmless, will multiply sometimes.
Do the black things on the small rock move at all? If so, it could be flatworms. If not, could be a sponge

 

[czwicky]

I honestly only noticed the black things two days ago and haven't noticed that they have moved yet. Flatworms should be removed correct?
Also any thoughts on the clam thing or the blue stuff?

 

[Squidly]

Like been girl said if it moves its a flat worm and should be removed. However, I have 2 of those black worm looking things that looks remarkably similar to yours on my zoa frag. It never moved, never grew, or never affected anything in my tank so whatever it is it should be harmless. The blueish stuff on your rocks MAY (although this is just an assumption) be some type of coralline i have red, purple, and a dingy pinkish coralline in my tank so I wouldn't rule it out as an impossibility!

 

[czwicky]

I've heard of blue corraline before but apparently it doesn't normally survive through shipping/curing very often. If that's not what it is then I'm not sure. It is almost fluorescent and glows under my moonlights. Pretty awesome to be honest.

 

[Squidly]

In that case it seems pretty harmless and just another mysterious quality that makes your tank unique!