Brown algae

Hi everyone, newbie question here............My 2 month old SW tank with FOWLR has developed a bad case of brown slimy algae covering the glass,sand ,pumps and rocks. i purchased a few snails to take care of the problem and the only success has been with a large Margarita snail. Only problem is that my Copperband Butterfly picks at it (he ate 2 astrea snails already). Are there any FISH that will control this brown stuff or any other inverts?

Thanks