Letting them breed in the tank is akin to having a cow in your living room in case you get hungry for steak. Not to mention they'll also poop, die, leave exoskeletons, leave leftover food to rot, stink, and possibly attack molting scorpions.
If you're trying to farm crickets, you need to give them something to lay their eggs in. A dish of moist sand, soil, or coco fiber works fine. You also need to give them lots of hiding spots (layered egg cartons work great), as crickets won't hesitate to cannibalize a molting tankmate.
Also, be prepared for some major stink. Roach colonies are less cannibalistic and tend to not stink as much.
If your emperor scorpion stops eating, don't panic.
Be nice -- you were a noob once, too
"Never ask an engineer to explain something, because he will."