i understand where you are coming from lupin, ive had some pretty aggresive severums a few years ago, but i understand kissing gouramis grow very slowly, and there are ones i read about on the internet that are 8" at 16 years. so unless kept in the wild i cant see them getting huge! besides i would deffinetly upgrade the tank if i felt the fish were too crampt so its not asif im setting them there for life