any suggestions on how you would incorporate a waterfall type feature to what you have described...which is excellent, by the way... I especially liked the idea of wrapping the fiberglass mesh under the front part of the substrate... Wonder whether anyone has tried running a piece of PVC under the whole thing with the sub substrate around it to be able to suck out the excess water from time to time...Of course there would have to be an elbow to a straight piece..it would be nestled in the substrate at the very bottom...think it would work????