I have a 180 gallon that I want to make into a paludarium but I am running into a few obsticles. First off, I need to use the divider method, since one side of the aquarium has a leak in it. I see that most people use plexi-glass to seperate the land and water. My problem is that this is an old DAS tank, and the bottom of the tank is not a regular 90 degree angle, it goes down the side glass, then comes out about a half inch and joins the plastic bottom and then goes down about a half inch. I hope you can understand what I mean. Its kind of like a rim on the bottom, like a stair-step. How could I seperate this? I tried using pond liner, but found that it was really hard to join to the glass. Any ideas?