I'm a bit late on the thread and see you've already got some good husbandry advice so I'll offer some roach feeder tricks of the trade. The only good thing about crickets is they tend to stay out in the open making good hunting opportunities for your pets. When thrown into an enclosure roaches will often freeze(no movement, no attraction) then dig down into substrate at the first opportunity and stay there. A good way to fix this problem is to crush the head on the roaches before you feed. This basically just slows them down, it doesn't kill them at all(roaches will definitely take over the world some day). They will eventually die of starvation of course if not eaten since they can't feed themselves with the mangled head.. With a crushed head you can leave them on their backs and they won't right themselves but continue kicking their legs for many days. You can also just toss them in with crushed heads and they'll do their scurrying around thing but it'll be slow motion and they won't dig down as quickly if at all. Make sure you do a thorough job on those heads though, I've found perfectly mobile, normal acting roaches weeks after tossing "incapacitated" feeders in an enclosure.