That is what I had to do with both of my mollies and guppies they was very mean until I got them mates. But guess what I have close to 400 fry now and I dont know what I am going to do with them all. And you can just about set a clock by this ever 28 days or so You will have 30 or 40 more fry and if you all are like me I dont have any more room.