It depends on what you are housing. I wouldn't combine Kritter Krumble with anything.
If you are looking for a "natural" viv, you could try setting up a "living" vivarium with little bugs and worms and leaf litter. They are supposedly really cool once they get going. No need to clean your viv but maybe every few years. I'll see if I can't find the link for it.
Actually, since Im not 100% sure on the rules linking to other sites just do a Google search for Bio active vivarium.
People use wood mites, earthworms and this little wormy things that ball up, Orchid bark, leaf litter, bark, and some kind of drainage.
The idea of bio active is to sustain a living, thriving natural habitat for your reptiles. The bugs will eat the poo and bones left over, the plants will increase O2, and among other things, no cleaning. Its a really neat idea and amazing to look at.
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