What is this?

I've never seen one of these before. It's hard to see but it's to the right of the snail. What is it?

 

Aiptasia

 

Should I fight it?

 

yeah, do a search on the forum. I personally use a product called aiptasia x. it is a pest anemone and it will sting fish and corals. They are mobile as well but I haven't really seen them move once they appear.

 

Ok. Thanx

 

You don't wanna wait to long cause they can spread & end up in places that's very hard to reach. Be careful not to get the aiptasia x on other corals & turn off your pumps. Check around tank for others also.

 

Had them all over my old tank cause I thought they looked cool. Used aptasia x one time and they never came back.