This is a discussion on what is this within the Saltwater Aquariums forums, part of the Saltwater Fish and Coral Reef Tanks category; -->
i just bought a saltwater reef tank and found these on one of the live rocks...
I've been gathering information for alittle bit in preperation for when I eventually get a saltwater tank but have never seen these guys before. Why are they so bad?
Some say that they might actually be beneficial in a FOWLR as extra filters however in a fowlr with messy eaters will cause aiptasia to spread even faster and get out of control. It just depends on if you want to constantly maintain the population.