Also what kind of shrimps? Depending on the type, they might end up as food.
I feed mine 2-3 times a week. Feed until they refuse. You'll know if they're hungry. They'll be out at the glass, in the open, begging for food like any other fish.
More info, well, most of what's on the net or in books is just a small paragraph of basic info. This thread has some pretty good info in it though. Run a search on RC on them too for more threads. Also, fishbase gives their characteristics and good info as well.