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They are aggresive I would LOVE ONE but my tank is community I might start up another agressive tank in the future and Yes they do like caves to hide in they also will it most fish smaller than it...uh I dont have to much info on it but http://liveaquaria.com/product/prod_Display.cfm?pCatId=364 go there its got more info on them. Good Luck and if you get one send me a pic!
I have had one for over 2 yeaars now. He is shy, docile and rarely seen except at feeding time. It is a beautiful fish indeed and a treat to see when I get to.....it is in a 175 bowfront with tangs, foxface, and a lionfish and does not even get pushy for food.