Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I would use a small fountain pump, available at most hardware stores. Test fit, and buy some vinyl tubing that fits the outlet of the fountain pump.
Put a sponge over the pump if you find it gets too dirty too often. They are not great at pumping debris. I find Java Moss and dog hair (I have a long haired dog) are the worst.
The size of the pump will depend on how high the total lift is, and how much water you want to move. The smaller tabletop fountains are usually OK to a foot high, perhaps 2 feet, but will not push much water (60 gph with no restrictions). That may work if you just want a slow trickle, enough to keep the Wabi Kusa damp in a small set up, but no real waterfall sound effects.
A bit larger (perhaps 100 gph) would be fine, and would give you more water fall sounds, if you had a spot, perhaps a special rock ledge, where the water could actually fall.
A larger set up (a couple of feet long, 3-4 tiers, perhaps 20 gallon capacity in the bottom) might call for a larger pump than that, or else you may have to use (or make) something like a spray bar at the top. You don't want it to actually spray, but you want water to be released from several spots along the length of the display.