I want to take my 55 gallon tank that I am not using right now and turn it into a tank that will carry fish that I can't hold in my 75 gallon reef. Meaning, fish such as triggers, puffers, eels, and lionfish. It will be a fish only tank and won't have much rock in it. Maybe 15-20 lbs at most. What can i safely put into this tank? The fish I really want to have are the Clownfish trigger, picasso trigger, and a valentini puffer. See any problems with that?