They make really versitile breeding equipment for small fish. I've had breeding nets, and breeding cages. They serve as a breeding place (forces the male and female together), birthing place (has a grate which the babies fall through) and growing place (albeit small, there's room to keep those little buggers from getting eaten).
When the female becomes fat place her in breeding cage, preferrably with the grate in. Once she gives birth (live babies) take her out immediately because those stupid little babies will swim right in front of her.
Guppies, Mollies, and Platies carry (are pregnant) for about 4 weeks so if you know when they bred you can judge when the babies will come. They can also give birth 3-4 times with just one mating. They store the excess sperm in a seperate sac and can refertilize themselves.
Once I had bought a pregnant female who continued to have babies for 4 mos with no male around!!
Ultimately you'll need a seperate tank for the babies to really grow in bacause they grow REALLY slowly in those breeding cages. If you invest in a breeding net, which are actually cheaper and larger, you can put one in your adult tank and the babies have a bit more room to grow.
(I had guppies, mollies, and platies before I got Jack)
If you are going to breed them for feeders you won't need to worry about inbreeding. Let them little suckers go nuts!!

You will need to have a fairly large tank however, to accomodate all those breeding nets and cages and babies and adults....
Personally, I'd rather buy goldfish feeders. They are tons less work and you don't get a chance to get attached to them as they grow!!

But if this is your choice, good luck and I hope this info helped!
------------------
Jen
