[sschind]

To Kitkat's suggestions I would add

feeding often

changing lots of water.

lots of cover in the tank


The more you feed the faster and bigger they grow but the more the polute the water so the more water changes you have to do. I know fish breeders who feed 4 or 5 times a day and change 50% of the water or more every day. Floating plastic plants will give the babies a place to hide from the adults.

also, the changing lots of water can sort of offset the larger body of water since the water is more consistantly fresh which is probably more important than physical tank size.