Hi stinax182,

I'll link you to a post where I answered a similar question on sorting nymphs from frass (try a bucket with varying hole sizes drilled into the bottom):
http://www.frogforum.net/food-feeder...phs-frass.html

The veggies and fruits are probably the most important food sources for the roaches. I usually use a combination of non-medicated chick feed, dog kibble, and baby cereals to mix things up every now and then. The gutload does not need to be high protein, but should be predominately grain-based and not animal-based.