Planning my pond extension here:
I want to have part of the pond for lilies. But I need to keep the koi away from the lilies. Currently, I am planning to sew a mesh enclosure out of patio screening (it's pretty tough plastic, the particular stuff I have), and support that with a PVC frame.
But what if I just sectioned off the end of the pond? And HOW would you go about doing that?
Can you use concrete landscaping blocks to make a wall? With 1/4" gaps between, for water flow? Is concrete safe for fish? Chemically? Texturally? Would they try to squeeze between the 1/4" gaps and get stuck, or rough up their bodies?
Any ideas that would take up less space than those concrete blocks? I only will have about 700 gallons, and would hate to loose even the space taken by the 8" thickness of those blocks. I'm not sure a wall of regular bricks would be stable enough.
I also thought about putting that patio screening on a frame of PVC pipe, and using that to block the far end of the pond. But I can't figure out how to hold it firmly against the pond walls, so the fish won't try to slip around the frame to the lily side.
And, of course, I don't want to damage the liner.
Ideas?