Help me identify

[mcolvin]

can someone help me identify this i noticed a few weeks ago

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[jtrasap]

Pics are a little rough kind of hard to tell but looks like 'maybe' a mushroom.

 

[bradleym]

+1 it looks like a small mushroom

 

[mcolvin]

and i tried to get the pic i could so is that good or bad

 

[bradleym]

It's a mushroom coral. Pretty harmless. Some of them can reproduce pretty rapidly and cover your rocks over a few months, but this is not always the case. Most people like to have a few corals in their tank for decoration.