You don't want to clean to often. They like high population density and the babies eat the frass of the adults.
I have been keeping Dubia for over 3 years now and I clean my tubs around every 6 months or so. I also like to separate sizes. I separate them into 3 sizes ,small,med,and large. I run 2 tubs, so after a clean out the small, and larges go onto one tub ( breeders), the mediums into the other (feeders).
Keep them hot and well fed and they will reward you with tons of babies .
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