I have used RO in all my tanks for the last couple of years. I find that the most important factor in an algae free, lush planted tank is tank maturity. As the tank matures I have fewer algae problems. This has to do with stability, but nothing to do with RO.
Every plant goes through a cycle of nutrient uptake. When its stores are full you may have a nutrient spike in the water column resulting in algae. This may be the reason why you get unpredictable algae blooms. Personally my dosing strategy is variable in relation to biomass, algae, and tank maturity. In essence, I try to maintain stability in the water column by varying what I put into it since plants vary their uptake.
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