If its FOWLR, and you don't mind the way those things look (personally, I think bubble algae looks cool...., majanos can add color, aiptasia can be ugly, but can also add movement (if they get big enough). Really, you'd only be worried about it "overrunning" the tank if you need that real estate for coral, other macro algae (which could out-compete it possibly), or if you flat out do not like the look. There are also some beautiful fish that will eat all of that for you that we simply cannot keep in reef tanks. If you're going FOWLR, I would encourage you to look for non-reef safe fish, as you actually have the opportunity to enjoy them! Raccoon-faced butterfly fish are beautiful, have a lot of personality, and eat aiptasia!
Just a thought....