It is a CO2 issue.....solve that first before anything. No nutrient dosing regime would work if the CO2 is not addressed. Why do you want 5.5w/g of light since the more light you add, the more demand it is on the overall CO2 and nutrients. Loose up on them and you get algae...(exactly what is happening.). I'll suggest you drop the light down to 2wpg which is easier but growth is definitely going to be slower. BBA is a CO2 issue and will stop growing if the CO2 is being addressed (all that is left is to trim the BBA off.). Hair algae is a high algae species (pretty much like plants and will grow in good conditions. You need to be aggressive at trimming the infected parts off and make sure you dose well.).
Regards,
Peter Gwee
Plant Physiology by Taiz and Zeiger
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