tai95 pretty much summed it up. I've raised the little guys, but their growth rate is painfully slow. I used a 3gal Eclipse w/ a large sponge over the inlet, and I covered the sponge in pantyhose material.
Fed many times daily with small amounts of finely powderized food. I mean, ground between a plate and the bottom of a spoon until it was like fine dust, turning off the filtration until all head settled to the bottom of that little tank.
Had to keep the bottom of the tank completely bare so they could latch onto the food. Kept Java Moss in there, added a little Jungle Aquarium Salt to help with molting (I believe there's a touch of Iodine in that salt, which is good for inverts). Used MTS to help keep things sanitized.
Got about 30 of them out of two clutches of eggs, but it is a ton of never-ending work for the meager results. At $0.25/shrimp at the local LFS, I think it's far more cost effective just to buy the little suckers.
v/r, N-A