Wondering!

[Fishnit]

Hi everyone!
I'm new here and was wondering if you could help me identify this thing growing in my tank. I haven't been able to find anything like it.
http://momentoffame.com/photopost/data/500/medium/What.jpg
This pic is a close up. It's about the size of a quarter
Thanks!

[smorrow5773]

Looks like a cup coral to me, if that is what it is, harmless. Feed it some brine shrimp.

[nemofish2217]

looks like some type of hitchhiker anemone.... i would probably get rid of it.... JMO

[teo241]

i'd second cup coral. not harmful.

[Fishnit]

It lays flat and when you starle it, it sucks back into the rock quick

[TippyToeX]

Fishnit
[welcome]

I think it looks like an aiptaisia. A pest anemone that you do not want in your tank. :(

[nemofish2217]

edit..... but yeah, i still think its some type of anemone

[Sk8r]

I've seen that, and it wasn't aiptasia. I can't say good or bad, but since aiptasia will not doom a tank overnight, I'd say let it ride while you consult all the 'intervetebrate salt' categories online.

[smorrow5773]

The sparkle in the tentacles is usually indicative of a cup coral, it definitely doesn't look like any aptasia I have seen before. Google cup coral and look at the pics, the hithhikers usually are clear although they can be orange/ yellow. If you id it as such, I believe they are nonphotosynthetic and needs to be fed if you want to keep it. (related to sun corals)

[Fishnit]

I think it kinda cool looking. It's brown with green stripes and a white center, it also has one tenicle that always stands upright like it's supoosed to lure fish
Thanks for your input all