You have a very high nutrient level in the tank just by looking at the "now" pic and seeing the cyano
and nusiance algae.
What, exactly, are your water parameters?
alkalinity (since you are adding buffers) -
pH (since you are adding buffers) -
How often do you do water changes and how much do you change? Do you use RO
water, tap water, well water, etc. for water changes and top offs?