So I'm thinking ahead to a 75 gallon vertical conversion. When I was making the lid to my current tank, the plexi was very hard to cut. We were using a dremel and I think I went through about 4 disks for a very small amount of plexiglass. Thin glass too. So for a vertical conversion, I want to have a plexiglass door so I will have to custom cut this down to size. What's the best tool to use? Or should I just try and find a place i can order a custom piece?