My colony is super clean.
They all pee in one spot and shove all their poo through the front 'window' of their tub. I have hardware cloth on the lid and front of a stand alone tub for ventilation. And the females pick up all the poops and throw it out of the tub. Amazing little animals.
I now put a little tray in front of the 'window' to catch the poo for easy cleaning.
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