you can spot clean like cat litter but you have to total replace at least every month or sooner, Your nose will
tell you when.
I recommend that you put a layer of fine non metallic screen to keep the eco earth or coco fiber from falling into the drainage
gravel or expanded clay balls.

When I do a total replace I use a wet dry vac to vacuum up the old.
I dig up my packman frog before and let it soak while I do the clean up.

as far as the feeders one of the other more learned members answer that one.
but as far as beetles go I would be careful some are carnivorous and might bite your baby .