What is this?

[angel]

I'm thinking it's likely a coral. But not knowing, can't be sure.

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[angel]

One more try

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[gymnothorax]

the picture is fuzzy, but assuming the cap is attached to the small fragment of rock underneath it you have a red ricordia mushroom, and a pretty one at that. it is technically an anemone, corallimorphian, but treat it as a coral, hardy species...moderate light and flow and it should spread but slower than typical mushrooms : )

[angel]

Thanks! It can move, so I did assume later on it was an anemone, but it does indeed look like a mushroom and I just love it. It's so pretty! Thanks!

[madreefer]

Actually it's called a ricordia which is a cousin to the mushroom coral. They are very pretty and fairly hardy. If placed on live rock the will form colonies by themselves or you can take a razor and bisect the oral disc to create two identical ricordias. This is one of the most simple forms of fragging, but should only be attempted after some research and when the coral is of sufficient size.

[madreefer]

Sorry my internets a little slow and didn't realize someone had already answered.

[angel]

That's cool. I have mushroom coral but this one is different--it has small tentacles. Very interesting! And once or twice a day it squeezes up real small.