Hey,

I've seen that video before. His waterfall turned out amazing.
Actually, i was in the exact same predicament you are in about 1 year ago.
I tried duplicating this video and it was not so hot lol. I ended up scratching everything
because the water wouldnt flow right and it kept leaking and was just a huge pain
in the BUTT! lol.

I really do like the way his rocks came out though. Although, i am not sure how
well you could paint greatstuff. You would have to experiment with it.
Possibly take a piece of cardboard and spray some great stuff on it and
test painting it on there. But remember you have to seal all the painting stuff
with silicone. Otherwise, it will bleed into your frogs environment. If you
do try this.. POST PICTURES - I want to see lol.

If you want a rocky background, you could always silicone the rocks onto
great stuff instead of the coco fiber. A mix between rock, cork bark, and
cocofiber could lead to a very interesting background. Something i am starting
to notice with my background is that after a year or so... you dont even
see the background anymore. It is so covered in plants that i feel like i
wasted so much time to not even see it anymore.

As for the tank, yeah you could probably get away with a 10gal. But
bigger is always better. Just remember, you may have 20" but after
you put in a false bottom and soil.. you may only have 14"-16"
depending.

Fuel for thought =)

-Kevin