AMAZING build, I'm picking up a few fresh OOW mossys in January and love your tank. I had planned on doing a small stream and love your idea on having pools cascade down the back..

I have a question though.. for your cave at the water's edge, is it just a cut back into the GS back to the tanks wall or does it lead to another entrance up somewhere else..

I had though about making a funnel shape with the egg crate and using it to link two openings but wasn't sure if my frogs would hide out in there all the time.