I agree with you. One of the tanks I have now I got from a guy who really neglected the tank. itis a 92 gallon and right now I have a sailfin, hippo,yellow tangs in it. I cannot bear to get rid of them so I took some of the live rock out to give them more space to swim But to my suprise they are very very well mannered. The hippo will skitz out every now and then but they are never nipping or jousting with their tail barbs at one another. They are all going in my wall project when that finally gets finished.