My Tank is 75 gallons. I've been dosing 3 x / week 1 tsp KNO3, 3/8 tsp K2SO4 and 1/4 tsp KH2PO4 and 2 tsp of Equilibrium. On alternate days,I dose 10 ml Seachem Flourish. My nitrate reading is 5ppm but my Phosphate is 10 ppm. I might have overdose on the phospate.