Im debating one of these 2 as my last fish in my tank. For the Flameback on liveaquaria it says that it "can nip at SPS corals" and this is the same thing the guy at the LFS told me. I dont have any SPSs but i have a bunch of different kinds of corals, so would i be ok? Anyone have one that can let me know??\n \nAlso, if not the flameback, i really like the Potter's angles, how safe are these with reefs?? Also, on liveaquaria it says its "expert only" but doesnt give any reasons why. Anyone know why these are "Expert Only"?? and again, anyone have one that could fill me in on anything else??\n \nThanks in advance.