I am setting up a large grow tent for my tegu and will now have room for a small pond. I want to make a small pond with a rock waterfall in the corner. I have no experience with making ponds or waterfalls. What supplies do i need and how should i create the waterfall? I was thinking of stacking rocks or gluing them somehow? Any help would be great! What pumps do i need and what glue would work for the rocks. also, do i need a filter of some sort? My Tegu likes to potty in the water.