So if you need or want a waterfall on the fly this Tetrafauna™ Decorative ReptoFilter - Filtration - Reptile - PetSmart is a good one. I have been running it for about a year and a half and it does a pretty good job. Plus it is a filtered waterfall which is nice with messy WTFs.

Or I made one out of styrofoam, GS, Grout and grout sealer. Below is the outcome.
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The waterfall was built around this pump and filter Tetra ReptoFilter™ - Filtration - Reptile - PetSmart