It's not desired thats for sure. I had it for awhile and it never got too out of hand, but was on its way if I didn't do something soon. As for what to do, there are many different ways to try and I'm sure looking at MichealTX's post will have alot of ways listed there, as well as a search, so I suggest doing this. Sometimes one way works for 1 member and not for another, you just have to do it with the trial and error method, IMO.
Thomas712 Does that bryopsis look like fern leaves up close? I got an order of ceriths with something similar to that on some of their shells and wasn't sure what to do and went ahead and added them that way. Well, the tang had a meal on it. Just curious, I bet I got lucky that the tang ate it.