I tried putting a squamosa in my 180 as an experiment. The fish in the tank are powder blue tang, purple tang, golden butterfly, neon goby, coral beauty, emperor angel and a black back angel. The only one that harassed it was the black back dwarf angel. Everyone else ignored it. That black back angel sucks. I put some zoos in the tank before to see what would happen and the only one that messed with them was the same dwarf angel. I'm kicking that sucker out of the tank. He is not that pretty anyway. Why should I not be able to keep corals in the tank when the only fish that harasses them is an ugly black and white fish.