need help id'ing something

[wablondie98664]

i was wondering if anyone would know what i have growing on my live rock, there are about 3 or 4 of them that i can see. they are maybe about 1/2 inch in diameter, brown whith what looks like little tenticles all around them. and yesterday when i put some live brine shrimp in my aquarium for the fish they stretched outward and grabbed some of the shrimp and closed around them. here is a pic, this is the best i could take without it being blurry.
TIA alicia

 

[mossad327]

Looks like a majano anemone. They're like aptasia in that they can reproduce rapidly, badly sting your other corals, and take over your tank. One or two look pretty cool in my opinion, but if it starts reproducing, I'd take it out.

 

[wablondie98664]

thanks for your responces, heres a better pic i just got.

 

[wyldgunz]

Its a little blured but it could be a small duster or glass anemone.