It is very easy with Zeo to over dose any of the basic four suppliments, the algae could be the result of the start2, zeofood7, or AAHC. Everyones tank is differant and you can't just go by what the label on the bottle says for dosing instructions. You may also have a latent PO4 build up in the tank sand, rock etc, that is being pulled out by the zeo system. Sometimes results take some time to be achieved, however, given some time and tweaking of the suppliments the tank will become nutrient poor using the zeovit method.
I found I was getting some hair algae until I started cycling th zeo reactor 3 hours on 3 hours off. Give it some time and tweek your dosing amounts and it will get better.
