My original plan is to surround the outer edge of my pond with flagstone rocks. I'm running into issues trying to get them to lay correctly on the liner that overhangs outside the pond. Plus some stones are thinner than others so I need to raise them up with a bit of sand or something. My only concern is all this sand going to end up in my pond the first time it rains? I do have a slight angle along the edge of the pond tapering away from it so things wash away from the pond instead of into it. Has anyone used flagstone around the entire edge of their pond? Do you have any helpful tips? Should I trim the liner back some? It overhangs 2 feet in some spots but I thought it would make a good weed barrier. I eventually plan on planting moss between all the flagstones.