Yep, definately aiptasia. Can be fine in a fish-only system (especially if you have certain butterfly fish that like to dine on them), but in mixed fish/coral tanks, they can multiply until you have literally thousands, and they sting the heck out of nearby corals....
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.