Pond Boss Forums GENERAL QUESTIONS Help algae

Louis, like others have said, you need to figure out where the nutrients are coming from. Be more concerned with Phosphorous than with Nitrogen, but look for both.

Algacides that have copper in them could be deadly to trout. With that said, I've used chelated copper products in my pond in small amounts (treating a 20 square foot area in an acre pond) with no ill effects when I had trout in it.

A Sodium Carbonate Peroxyhydrate based algaecide is safe to use with trout in the water, but like any herbacide, you have to watch that you don't kill too much at once, because when it decays it needs O2. The decaying matter will win when when it comes to who gets more O2, it or the fish.............