Hi so I have 3 adult female mollies who since I got them about 3 months ago have had multiple fry. I’ve been separating the fry into a separate tank which now has 16 babies in it. It’s a 15 gallon tank (the adults are also in a 15 gallon tank). Today 10 new fry have arrived. Question is can I put the new fry in with the 2 month old ones meaning 25 fish in one tank or should I take some of the 2 month old ones and move into a new tank? The let store won’t take them till big enough to mix in with adult tank and don’t think 2 months is big enough??