Hi,
Yupe, I would agree that a high alk will help slow down the growth of green algae. If you are not doing it already, I would drip kalk in to the system to help bring the pH up and control the pH swings. Keeping alk will hold the algae at bay for a while, but it can't keep it there forever.
Hair algae usually means there isn't enough nutrient export. Nutrient import comes from food, light and other sources. Nutrient export is usually our skimmer and a refugium. So, you'll have to decide how you want to improve your nutrient export or how to reduce your unwanted nutrient import. Basically, a balance between import and export is needed. So, this is something you'll need to work at in the long term.
Good luck !
- Victor.
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