Who's going to win?

[Frenchie2]

I have a piece of LR that is placed so it makes the foundation of my rock work. When I got it, there was a piece of left over disc plug glued on it but nothing else. After a while, I saw some little zoos starting to grow around the disc. Did not think too much of it... Well now, holy doodle, they are taking over the rock and spreading like mad. I was told to put some mushrooms around them so they would not grow faster. I also have acans next to them which can be moved. These acans are pretty agressive (holy cow!) and I've seen them doing some real damage to a couple of my other corals. My question is: Who is going to win between the acans and the zoos if I leave the acans there? See pic. Your opinion is appreciated. Thanks!
Oh, also, can zoos be killed??? If so, how so without soiling the water in the tank without taking the rock out?