What are these?

[Frenchie2]

These things have been growing on one rock on one side of the tank. They are mostly flat but some of the ones located at the back of the rock extend a tube-like. Are they of concern? If so, how should I get rid of them?

[russp]

I believe they are green button polyps , my tank is full of them.

[ScubaSteve]

I can't really tell from the picture but they're either aptasia (bad) or they are a brown palythoa (OK). Are they a solid colour or kind of translucent?

[bignose]

looks like palys

+1 polups OK.

[reefwars]

Def not aptasia or green buttons my votes for the paly's also

[reefwars]

The ones in the back are extending to get better light personally I love paly's and zoa's regardless of colour