oh, just thought of this one... a long time ago, i got three stripe humbug damsels (yes, i actually wanted them in the tank and it wasnt to cycle it ). as they grew up, they started to claim territories in big sps colonies. soon, those colonies had bare spots even tho they were still growing and healthy. took me a while to figure out that those damsels were actually picking at the corals. you have no idea how long it took to tear down a 240 gallon tank that was PACKED with live rock and sps to get those 12 devil fish out!