**UPDATE**
wanted to post some better pics of this one since i was out there working on it the other night.
The balls got the water wayyyy to messy with the dirt side in there so it was removed and filled with big chunk aquarium gravel. and then the 2 balls where removed all together and replaced with a cool California King.
I wish I had taken pictures of the process for this next shot. The waterfall is powered by a whisper 20i. after the foam was added for the background, i cut away at it to create a nice little NOOK for the filter to set into(it snapped right in) then a 3 piece "bridge" was made to make the slide part of the waterfall. it was foamed with GS and then the black rocks were siliconed on individually. it was quite a projetct but MAN does it look good.
all photo's by the way where taken with my new T-mobile G1 !!! nice camera!