read this, it is a thread where BigC helped me out when i was going to try it, unfortunatly i couldnt commit to it
Exract
ice-cream tub. float this in an aquarium and cover the peat in the tub with about 30mm of tank water of around 75'F. Some of the eggs will hatch almost immediately. The fry are really, really small, you wont believe how small these things are compared to guppy, platy young.