Pond Boss Forums INTRO New Forum Member Introduction Hello from Idaho

Louis, welcome to the forum. Grass carp won't control algae, tehy focus on vascular plants.

If you want to treat the algae in the pond with an algacide, you have to remember that trout are very sensitive to copper. You can use a copper based product like Cutrine Plus, but you have to use it in small quantities and be very, very careful.

A better option is phycomycin, Green Clean or Green Clean Pro. Neither of those are harmful to trout.