FirestonePondGard PL45-1010, UV and Ozone resistant,45 Mil,10-Feet x 10-Feet Rubber Pond Liner

Seller: can this be **safely** folded for square corners of a 3'x3'x3' tank? by "safely," I mean no cracks at folds in a few years.

I know it says "non toxic", but has anyone had any issues with fish, amphibian or insect toxicity after using this for their pond?

We need several of these liners to complete our pond. Can you glue these together for a larger area?

My pond is 7' wide, 8 long, 4 deep-- what size tarp should I order?