How big of a tank do you guys think makes a good qT tank? I have a 10 gallon tank but I feel the fish are to crowded and not enough room to swim . The fishes I plan to get do not get bigger than 5 inches long. I appreciate all the help I can get. I was thinking of a 30 gallon tank. I also want to be able to put like 2-3 fishes at a time in the qt tank as of right now I can only put 1 fish at a time.