I was wondering if a breeding pair of pearl gouramis would be comfortable in a 37 gallon, but several people told me they would be better off in a trio. (less aggression) What would be the ideal group size, and could they fit comfortably in my 37? Also, none of the local pet stores have pearl gouramis, and I haven't managed to find an online fish store that lets you pick the gender of the fish, any suggestions? Sorry, I know that's a lot of questions I'm kind of new at keeping gouramis.