In theory, no. If you fertilize, it helps to jump start a phytoplankton bloom that decreases the sunlight penetration that the algae needs.

However, I've seen the theory disproved too many times.

It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

Without a sense of urgency, Nothing ever gets done.

Boy, if I say "sic em", you'd better look for something to bite. Sam Shelley Rancher and Farmer Muleshoe Texas 1892-1985 RIP