your ph looks ok in relation to kh. so co2 prob is not the issue IMO.
so i'd pin it on the flora pride...what's in it or rather what's not in it.
GSA is po4 deficiency. hair algae is usually a secondary problem which i'm not too sure... there's many kinds. comes with plants then never wanna leave. manually remove.
brown algae is normally excess diatoms. get some otos to eat it...
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