when the pond is filled up, what will the height from the ground to the water level be? i ask because not too long ago i hooked up a rena xp1 into my wds enclosure and these filter require certain distances from the top of the filter to the waters surface. i am not 100% sure but im pretty sure my filter manual said 24". well that was not doable, and i have it at about 14" and i have to preime the lines every so often or else i will lose its prime. i think a pond filter is what you will need if you want to run the waterfalls from it. if you can get the fluval to run i would use it for filtering the water only, and get a fountain pump from home depot or lowes and use it to run the waterfall. i also use a fountain pump for the misting system for my wd and it works rather well.