I know you've decided to set up a breeding tanks, but for anyone else who might be reading:
The beetles are fine to feed to your reptile
Most won't eat them in large amounts though, they're not as tasty as mealworms (apparently
)
Also for breeding, I would stick a heat mat to half of the back of the tank. They need warmth to breed
and a deep layer of bran flakes usually gets them breeding well.
They can be fed any vegetable scraps, dog biscuits, cat biscuits, cereals, non-acidic fruit such as apple, strawberry etc. and don't put water in, no matter how shallow the bowl is they always manage to drown themselves. Put slices of carrot in instead
Don't mist the cage, the bran will get mouldy & they won't breed. Don't let any of the food get mouldy, the bugs smell bad enough as it is lol!
I started off with about 20 mealworms & now have around 200 beetles breeding. Supplying food for my bearded dragons & chameleons
I regularly chuck a few beetles in as food for the reps, keeps the numbers down so I don't get over run. The beetles will also kill each other, then eat the body. If you notice that your numbers are decreasing then give them some crusts off of bread & a few more bits of dry dog food.
Oh & try to separate the beetles from the mealworms, the mealies just love to devour their parents. :/
Hope I've helped!
Xx