Should you have objects in cage for koi to rub against? I cant treat my 3/4 acre pond and know I have parasites so I started wondering if I should add brushes, yarn around pvc pipes or something that the koi fish could rub against? I did add a soft screen on the bottom thinking it would be like a bottom, maybe this would be good enough or would they just rub again the metal cage?

Koi are doing good just thought this might make them happier.

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