Is this aiptasia? It has a green center.

[Golden Age]

I saw this tiny thing growing on my rock. I saw it earlier in the day and thought it was a polyp because it was closed like a zoa or paly but when I has the moonlights on it opened up.

It this aiptasia?

You can't tell from the pic (it was hard to get a good picture, it's really small) but it has a bright green center.

http://i59.*******.com/r01jc4.jpg

http://i59.*******.com/qp1p8k.jpg

http://i62.*******.com/2jbpn6c.jpg

[thedasher]

Looks like a polyp.

[pyithar]

looks like a polyp.

+1

[thegrun]

+2, although they can spread and become a problem also.

[ca1ore]

Yes, paly of some kind.

[kw22]

+1 :)

[panhandler01]

What they said.

[skippy2]

what they all said :)

[Zacktosterone]

i would touch it and see if it disappears. if it does then it's probably aptasia. if it just retracts like a zoanthids or pally then don't worry about it. unless it overgrows in your tank

[CuzzA]

Lightly prod it with something. If it completely retracts to the rock almost laying flat, Aptasia. If it just closes up, polyp.

Edit: Somehow I missed reading Zacks post.