Re: is it a must for clay substrate for pumilio?
I have been using ABG mix for several years now and have recently begun to create a pocket here and there on the tank floor for clay. No big deal, easy to do. I have no idea what the actual statistics are or science is, I just know that the more bases I cover, the better off my frogs probably are.
I also dust regularly with a couple different supplements from different manufacturers. I have also started redoing the tanks and vent locations to accommodate the addition of UVB, both for the plants and the frogs.
I do know some serious breeders who use only clay substrate covered with leaves for their grow out tanks and seem to be having success with it.
You don't have to spend big dough or days mixing, just get a bag of Turface from a good garden center and that works fine. Looks just like kitty litter, only I believe it has been fired.