Get a bigger container and give them some paper towel tubs or toilet paper rolls to climb on. Put a couple baby carrots in the container and just a few water crystals. Throw the carrots away every 2 days and replace with new ones.

Crickets will crush each other if kept in to small a space with nothing to climb on and as Carlos said you need to feed your crickets and dust them with Calcium and a Multivitamin supplement.