Ive just realised reading some other points that you can use glass barriers to hold water behind. So in theory instead of having my visitors look down on the crocs in the water through a grade 3 fence with glass window at floor level, I could create a glass barrier and have the path drop down so they can see the crocs at eye level on -1 level. Is this hard to do? I guess the top will need to stay level, with the glass sections extending lower to accommodate the dip in the path. Have others done this?