what polyp?

[fishboy091]

theres this polyp in the tank that i mix my water in and it looks like a yellow polyp but i know it doesnt need light because my lights are off. it only closes when i pour water into the tank. what kind of polyp is this? is it aiptasia. its really small too.

 

[wax32]

Quite likely.

 

[mismodliz]

We had a problem with aispstasia overtaking our tank awhile back. Ours were pinkish in color, and they multiplied quickly! We bought some peppermint shrimp, and they eventually got rid of the problem for us.
Here is a picture of aipstasia.