You could get a small net that hangs inside the tank. It's rectangle shaped and seperates the babies from all the other fish. If your tank is planted and has surface plants, you could also let nature take it's course. You will have some survivors if you try this last method. Make sure you know what you will be doing with all the babies if you go for the breeding net. See if your
lfs will take back some of the fry once they get bigger.