I can't believe how easy these guys are to care for - seriously. I think they're even easier than our freshwater aquariums! They're extremely clean and very low-maintenance.
And, they don't urinate, so that's a HUGE mess that's not being made right there.
And yes, the substrate is rolled oats. Kevy suggested it, since it's cheap, clean, natural, and digestible, just in case they ingest it while feeding.