I can't say what caused the patches or if tilapia had anything to do with it...the babies consume the vast majority of it by their sheer numbers. Since it is the offspring making the largest plant impact and are too small to feed on the pellets, I doubt stopping feeding would make little noticable impact on the reduction of FA.
BTW, the ones I couldn't make it to may not feel I made enough effort, even if they understood. I hated disappointing them.
