Now I have a better idea of what you are trying to bulid, but that link still doesn't clarify how exactly you plan on doing this?
Much info is available here, but based on that video I am assuming you are going to shape your general waterfall using foam and seal it with concrete/epoxy/etc? I havent tried that build myself so I'm not super familiar with it. You will probably want at least 1 can of GS for "detail work" and "fine tuning".
You should do a lot more "design" before you just jump into the build, especially one that is somewhat complicated. You WILL have troubles down the line if you don't plan it out well, believe me! Especially the location of your pump, tubing, and the path of water flow (water is MUCH more difficult to guide than it seems).
Are you attaching the waterfall "steps" directly to your background or making it off columns off the ground? How are you making the background?
I see the general idea you are going for, but there are several methods to build this so it still ...depends :P
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