I am very interested in plywood tanks, I have noticed though that they are not as cheap as one may think after all the materials. What have you guys come up with for cheapest ply tanks. The two most expensive things are the liner or epoxy type substance everyone uses as well as the glass. Im not too familiar with epoxy like products and I know they must be fish safe so what have you guys come up with. As for glass I believe I could find a used 150 or similar tank to get the glass from that would be cheaper than most glass shops. I was also wondering could you skip the epoxy, I assume it would cut down on the life of the tank but would it be possible? I'm currently renting and just want a temporary large tank anyways. Could you just use lot of silicone on the corners and have it hold? Also has anyone tried pond liner, I would figure it would work but it'd be tricky around the glass? Id like ideas guys!!!