I agree that prof help is warranted and suggested to hold off on more fish. However he said no ! My view of this is that we should try and help guide him through this not just say the sky is falling. Gather what info you can and lets see how we can help. I am not going to define "extensive" which was not suggested by anyone. An extensive feeding program on a 210 acre lake would cost way more than the fish being contemplated. This is not some 1 acre pond. He could easily run 5 feeders with a supp feeding program and not make a dent (measurable change) in the clear water quality. IIRC this lake is twice the size of RM and has somewhat similar properties (acid with water flow and clear water).