This is my second year with 5 RES in my 8000 gallon koi pond. This year they are destroying my lilies. I'm happy for them to eat the greens but they are killing the lilies. I have tried offering leafy greens but they are not interested. They take a bite and then spit it out.
Does anyone else have experience with protecting their plants? Also, what greens do you feed your RES? I saw a floating ball thing to put greens in, does anyone have experience with that?
Thanks for any advice you have.