I've been thinking about mosquitofish as a low maintenance species that I could keep at room temperature during the summer. If I did get some, though, I wouldn't want them to breed, as I don't particularly want to care for fry and don't want to have the them for more than a year or so, max. Any web source I look at tells me that I should have a mix of some males and mostly females. I was wondering whether it would be alright to keep a group of only one gender? I know that they are a decently social fish, and so would definitely keep them in a group, but would it be detrimental for the fish to keep a group of only males or females? Which gender would be better?