Just wondering if its OK to mix anything with eco-earth and use as a substrate. Trying to come up with a sub-Saharan mix for my red legged runners. I know that moss is out of the question (impaction risk) but was thinking some sort of sand ???? I have tried and tried to find a specific definition of sub-Saharan but no luck. Also, since I will be getting 3 Tomato frogs soon, besides the eco-earth as a substrate, I have seen photos with what looks like moss(?) as a substrate. This seems like a hazard to me. (I'll attach it) Any advice will be a great help!!