Phosphates are zero by redsea test. Nopox dosing are based on nitrates tho. I know phosphates are there feuling the akgae im seeing. I considered dosing some phosphate to get balanced level with nitrate and continye Nopox but like the chances of full fuge with vodka vinegar if needed instead. IM hoping that will match what i have for biofilter vs nopox. Thoughts suggestions im open too. My reading of Randys and others exp are pointing me this way so farYou are a trooper. Glad to hear you still love the tank. That means you will keep at it. Curious, where is your Phosphate level?