Do you have a waterfall kit or are you going to run the tube through the styrofoam background? I typically use a nice piece of cork bark for all my waterfalls. I run the hose through a hole I drill to size and then seal with silicon. Then I build up around the bark with substrate (soil or sphagnum) and let the water run down the face of the cork bark. I try to select pieces that have a couple of deep channels running down the middle so that the water doesn't flow off the sides.





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