I struggled with algea on the glass for a lone time. I'd still say I have about the same amount as if I wasn't on Zeo. I clean with a Mag float about every 7 days.
I'm convinced it's a side effect of Zeo that passes over time.
Are you running any phosphate remover like Rowaphos?
Personally (and I'm not expert) I would return to the Zeoguide spec for the 4 basic Zeo products.
Run like that untill the next rock change and monitor the phosphate and nitrate levels closely.
I have found there is quite a battle for the available nutrient in the Zeo System. The biggest issue is ensureing that the ZeoBak is the winner. The addition of CV, Spur2, AAHC, Sponge power and others, Make more nutrients available for other bactirias or Algaes. this is the main reason you do not want to start the addition of these ellements too soon. (despite what many people say on Zeovit.com)
This is my opinion only but through the last 2 1/2 years I have found controlling the additional ellements can resolve a lot of problems once you are running a low nutrient system
J
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