I was in the same situation and i just bread for the fun of it i have a 1.2 set up. if you can get 2 females to sucessfully reproduce constantly that will be all you need. my girl birth 14 and 9 made it her first time going on her 3 litter it will take about 4 to 6 weeks for them to get at a good size for them to be food so you will still be buying food. i seperated her just before birth but you can leave the set up together unless babies start getting ate.
that set up should allow you to feed 3 at a time depending on size!!!
good luck...
tip put vinilla in the water smells get crazy!