By the way, the most economical way I have seen involves a 10g with ALOT in there. As soon as a female is spotted holding she is removed to a fish bowl with a sponge filter and some java moss. Has babies, put back in tank. This way you aren't using tons of energy and can make more shrimp and you'll ever need. The guy I knew doing it has 2-20gL going for breeding and about 10 bowls with fry.