They almost never get left in the tank, my beardie is ferocious to anything that is smaller than it and can find them, and if not, I get them. These ones have been under the water bowl, which I can't look under or all of the water will spill out and I don't wanna clean it up.Please find them and get them out crickets should not be left in the tank - they will come out at night and bite your dragon causing infection-- please clean the tank out-