I have just completed my koi pond and want to add some lilies and lotus in pots. My pond is 4.5' deep with straight sides and has an EPDM liner. I am looking for something to use as a plant stand that would raise the pots up 2-3' for a better depth for the plants. This needs to be something that would be stable, have a base that would not harm my liner, and ideally a safe place for fish to hide under the stand.
Any suggestions that I could buy or make?