Would algae overgrowth be good/bad for the Great Lakes

Question

I know that algae reduces carbon dioxide in the atmosphere & makes more oxygen than trees. I am aware that there are some species that are allergic to algae and will die in it, but as an overall whole how good/bad would it be if we just let algae take over the Great Lakes.

In: 1

Answer 1

Ecology gal here. Excess algae causes the water to gain more phosphorus and nitrogen, and have less oxygen. This creates a harmful environment for fish to live it and they will die.