I have 5 guppies in one 10 gallon tank and was wondering what behavioral mean that by have schooled. I need to decide whether or not to get more. My tank is currently fully stocked by soon I'm getting a 5 gallon that I'll use for my betta and I'll probably put fry in there and the betta into his current one gallon ( I know, really small, that's y I'm getting the five gallon) so he betta will only be back in his small tank if I need the five gallon for fry, hospital, quarantine, or emergencies like the tank cracking... I had one emergency where fish kept dying and I didn't have a test kit ( I do now! Lol) so I lost 3 and I was at my dads house while this happened so my mom told me about it and I told her to change the filter media because it was due and she did and that solved the problem.