I used to ride a lot as a younger person, always wanted a horse. Did charts of characteristics, what mix I wanted on and on. Then grew up, sort of. Honey told me to get a horse for here, I said nope. Like my bones whole and he wants to travel when he retires. Hard enough with a tiny dog, veg garden, pond and now bees to travel. Lots of planning.
I used ppl liner for my pond, it floats beautifully. I put in a piece around 5x5 in the deep end. The fish love the security it gives them when all plants are gone and the water is not moving. The gang hangs out under it most of the winter. I have the underwater cam right where it floats, during the winter I can watch the fish "sleep" They do move around a little but very little. Being black some of the floating plants that get under it actually grow in the winter, a little warmth from the sun hitting it. I tie it to the shore so it stays in one place. Even with snow sitting on it, it has not sunk.
I usually put it in once I groom the lilies. They are getting groomed soon, our temps are diving down, 29-30 at night, 50ish during the day. The pond right now is 54 or so.