Anemones?

[Mano]

So when I first got my live rock, it had small empty clear/green tubes in clusters on one side. I didn't think much of it, they were just empty. They were empty tubes for about 12 days, then I installed my lights. A few hours after the lights came on, the clear/green tubes turned brown, and next thing I knew, little heads that looked like tiny anemones appeared.

They are very tiny so I apologize for the bad photos.

Empty tubes:

Little heads after the light:

They're very tiny, the bottom picture, the entire area from the far left one to the far right one is only about 3/4ths an inch. I've had a long fight with aptaisias in tank, and I'm just worried about the zoanthids I'm planning on putting in (hopefully) in a month.

Can anyone ID these and tell me if they'll be a problem?

Thanks!

 

[Murex]

Thats a really big colony of a kind of feather duster, I think calcareous tube worms. About if they are a problem or not, if it is a colony of calcareous tube worms, is ok to have them because they work as a natural filter for the water as they filter feed.

 

[Mano]

Thanks muchly. I've had it suggested that they also could be hydroids, which are still ok to have around, so I think I'll just leave 'em be and not worry about it!

 

[djconn]

I agree, I think they are just small tube worms and are beneficial to your tank. Congrats! :mrgreen: