duke33;2483028; said:Right on! I would have used Marine grade plywood myself. I don't have the lids you do and my fish are always splashing.
Why is that? Unless the word has a different meaning in the US, "Marine" ply is actually untreated and made with a special glue that can be softened with heat so the ply can be curved to shape a boats hull, and is just a big fat waste of money for this kind of usage. You would want normal ply but H3 treated if its going to get wet, either that or paint and seal it well.