Yes I already have a RES that I have had in a pond at my last house (in ground pre fab).
I have some pics...I put a little water in to see how things did and I need to make some changes. I put plywood on the bottom but I used 3 scraps I had and its not going to work (see pics)
So you wouldn't do wood on the bottom because of rotting and mold. What would you use to get it flat on the bottom. Its yard (grass hacked with the weed eater) on the bottom so its not going to be flat. I would like it flat so I can put pots with plants and not worry about it tipping over.
As for the sides I really want to put something now...the landscaping timbers make it wavy and thats ok...but the areas in between the timbers there is nothing behind the liner supporting it. It feels like a spot that the turtles will tear up poke through. Am I right...what should I put if not plywood? Will that insulating board work and not rot on the sides?
This is the bottom where the 3 sheets of ply meet up. The ground under them has dips and stuff thats why I wanted the plywood but a single sheet. Now I dont know what to use...maybe some dirt to fill the yard under the liner?