Sorry for any confusion - I recommended using both "false bottoms" together as that is how I designed my viv. I will try to describe (no pics yet - sorry). I have an egg crate false bottom that covers about 70% of the tank floor up to 2 1/2" w remaining % of elevated floor using clay hydroton. I made side walls to keep the hydroton and Frogs from ever being able to get under the eggcrate false bottom. If you were to view the viv from birds eye view w out any plants, there is basically an L shape of space remaining where the hydroton is filled in (level w egg crate) with the corner being sloped down to create an easy access - exit "bathing area" for the frogs. The reason for not putting hydroton under the egg crate is to use water as medium, which can be easily replenished - thus removing toxins etc that build up over time. I also wanted a larger water mass that could absorb more pollution keeping the "bathing area" as fresh as possible for the frogs and any future (hopeful) egg laying. Does that help clarify?Huh? Having trouble figuring out what you mean.