Are these pest anemomes

[aklausing]

I'm fairly new to the hobby and have been getting tons of information reading this forum. I have a 28G JBJ Nano Cube setup for going on four months. I bought a hammer from someone tearing down his tank and the frag disk had a few of these (see attached picture) on it. The few have grown to many in a little over two months. I initially didn't think I needed to be concerned, but now I'm wondering if these might be some kind of pest anenome. Can anyone help me identify?

 

[clowns101]

Nope they are just small little polyps!

 

[jt_milstead]

Looks like some kind of polyp to me....

 

[aklausing]

That was what I was thinking, but wanted to make sure. Thanks!