Hi Candace
Sounds like you have a cool setup - being able to see underneath the enclosure.
I use a very deep layer of litter for my little ones as they love to dig and tunnel, and as you have discovered they have tiny poops, so hardly noticable amongst all that lot
Hopefully they will use their potty for wees but even then as you say Carefresh is very absorbent so you can potentially go two to three weeks before doing a complete clean out, in fact I know some Roborovski Dwarf breeders who use a mix of peat and sand in their enclosures a bit like a gerbilarium and they only need clean this out every quarter. I try a similiar thing with a mix of wood shavings, carefresh, wooden pelleted cat litter, shredded blank newspaper parchment (I live near a printers!) and brown paper, empty cardboard egg boxes and plenty of toilet and kitchen roll tubes. I can spot clean every day and as my litle ones use their potties well if I wanted to I could go a good month or more easily without completely cleaning the enclosure out, and to be honest I do get the distinct impression they do not like being distured too often. I empty the coconut out at least once per week and put fresh thinly shreddly tissues in and they then spend a good day pouching them so they go nice and crinkly.