It can look nice, but it usually kills whatever it touches, so I would suggest putting it on an isolated rock, so it cannot grow up to other corals. I wouldn't classify it as a pest either, but it can be invasive. It also can be peeled away from rock or glass if need be. Gently slide a credit card or something flat under it and pry up the purple mat and you can glue that to frag plugs or whatever.