Algae film on glass

[Ernie C]

How often is the norm for algae to grow on front glass in between cleaning? I start getting a film of brown/green dust like algae on the glass in about 2 days.

 

[amazongb]

I get green about every 5 days.. I have a bunch of snails though, that helps

 

[Retro Reefer]

I use algae growth on glass as a indicator of nutrient levels in my tank. For me 2-3 days is the sweet spot, If algae covers the glass in a day my nutrients are too high and if it takes 4-5 days my nutrients are to low.