so i went to petco to pick up some fruit flies for my mantid. but i think..they are dead? what is it supposed to be like inside a fruit fly "can". i opened it and inside is a little peice dry of foam paper stuff with a bunch of dry greensih blue crusty stuff which im assuming is supposed to be food. there are a bunch of little white things on the sides (larva?) and a bunch of dead flies. i was expecting to open it up to see a humid environment with a bunch of life inside. so what do i look for when i return this one and go back for another?