Fresh2o
Aquarium Advice Addict
You shouldn't. Algae outbreaks happen when there's higher concentrations of nutrients, if you're not dosing anything, theoretically you should see a decrease in algae.
If anything I might see signs of nutrient deficiencies in the leaves when I return from week long absences. I'm doing a 5x dose but gone for 7-10 days.
Regarding the nutrient levels, I've combated green spot algae (GSA) which sometimes occurs after increasing the lighting by doubling or tripling the phosphate levels. Yes, on paper it does not make sense but I've seen in happen on more than one occasion. I believe the additional phosphate encourages plant growth and they begin to outcompete the GSA (or any algae in general). Or it could be that GSA does not favor high phosphates. I would have to test the latter in a high tech plant-less tank.