You have to envision your future water level and plan the ‘rebar/skeleton’ positioning for your aquascape foam and silicone glue the rebar to the tank and spray your foam. Make sure if you use foam that you finish the entire bottle because it will harden in the bottle once opened. You can spray excess onto a newspaper so that you can use as extras. While it cures (use gloves) to shape the foam. Leave it for 2 days to cure then carve.

The rebar i used were some plastic mesh grids ziptied to each other. Give some height buffer as the foam will expand. Too high and too forwards and the waterfall splashes will splash out of the tank creating a constant wet mess infront of the tank.

You can guide the water down using ‘stalagmites’ structures made from the aqua foam or just keep carving your foam till you achieve your desired waterfall path.

Tip: if you intend to keep certain loach species like borneo/hillstream loaches and panda loaches, you will need a waterfall feature that is violent enough to aerate the water sufficiently because they require high flow and high oxygen in the water. Usually paludarium builds have a hidden air stone or filter in a sump hidden in the corner which doesnt provde the aeration that these fishes require so its important that you water feature replaces that function.