hey i did have the same problem real easy fix... first off did you buy 1000 crix at full size or smaller cricket do shed there skin when getting bigger.. also a hole in the top is not sufficiant air flow you need the both sides cutout for a cross breeze. when a cricket dies it releases a gas to harm what ever killed it... so when one dies 2 will then then 4 and so on you MUST keep it clean ever 10 days pull out the milk crate and transfer to another bin get what other crix are still in there out pull all the bodies and wipe with a warm towel. repolace crix... this will help... also have you noticed a smell??? thats the water crix stink when wet as tod said they could drown i use potatoes and apples pears.... what ever is left over from dinner or snack ( peels work good and carrots) any wet fruit. also add bran for substance of the dry sort and change the food ever 3 days.... unless they eat it all.... ok i think that is all ohh . also i hope your using aluminium screen i had a break out using fiber glass they chew through it quick. ohhh almost forgot keep em warm... lot less will die... also if you r getting noise complaints i have added a light to the top of mine to trick them into it always being day time... if you like pm me and i will sent you a pick of my crix bucket to give you an idea. im trying to breed in mine aswell.