Crickets need their space. Over crowding leads to cannibalism.
What are your cricket's water source?
Rick,
I've tried using oat meal as a substrate for crickets, but from experience and reading on other forums that use crickets more than mantid keepers, keeping a cricket bin's floor spotless is the key to healthy crickets.
Dog food is great, IF you're breeding them.
"Gutloading" with dog food, is not so great.
Keeping crickets healthy and keeping their stench to a minimum takes a simple "card swipe" every other day.
Get a card, a metal ruler or something that is thin but firm, and scrap whatever is on their container's floor. Dead skin, poop, old dried up food, dead crickets etc. Get that out of there, don't spray a paper towel and whipe it afterwards, wetness is a bed for bacteria that is inviting them to.. you know
lol.
Heat, and a water source is very important. A very thin slice of orange will not only hydrate them, crickets love oranges and the citrus smell lowers the stench of the crickets.
ALWAYS use some sort of lid, or cardboard, plastic plate... something of that sort to put there food on. Keep the wet and dry foods separate for crickets.
Crickets bring the meaning "poop where you eat" and they're by far more disgusting than blaptica dubia roaches IMHO.
If you're planning on feeding the crickets to specifically mantids only, I would gutload with bee pollen powder mixed with a touch of honey to only thicken it into a dry paste.
Water source could be a very small piece of paper towel that is wet with good clean water. Not sure how the acid of an orange would effect a mantis?