Hello, what would you say, is a 55g tank to small for 6 cuttles or would that be enogh? I've red that it's recommend to use a 75g tank for 6 of the cuttles. I ask because of the tank propotions, i like a 24x24x24" square tank. If that is to small I take a 30x19x24" tank or something like that. That would not be the problem.