Depending how many roaches you have you can buy the buckets from like lowes or home depot, the paint bucket things. Buy like 5 buckets, drill/melt say 1 inch holes into the bottom of one, then like 1/2 inch in another, then like 1/4 and so on... leave one bucket untouched... Put the 1inch holed bucket into the untouched bucket, dump in your colony and lightly shake/twist and all the NON adults will fall into the untouched bucket.... empty untouched bucket and then put in the 1/2 inch and repeat... keep doing it over and over and you can sort the frass out, smalls, medium, large and so on... you get the idea the sizes aren't exact but you get the idea
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