I bought two male guppies for my 5 gallon tank and moved my guppy girls into the community 10g, which has lost several tetras (one to dropsy, three due to having been dyed - duh me why was I dumb enough to buy dyed fish?). After they were quarantined, I moved them around for the moment so that I have one girl with each male. I plan to breed them, put the boys in a different 5g, allow the girls to give birth in the original 5gal, move the girls back to the community tank, grow the babies until they are old enough to split between the 5 gallon tanks, the 10 gallon tanks, and giving to either a fish store or a teacher who keeps guppies in his pond. So, on to my question: how long should I leave the girls with the boys? a day? a week? a month?