Sera test - Nitrates 50mg/l, PO 1 mg/l, Salt 1.05
75 gallon tank, 3 gallon sump, in sump protein skimmer, 1 bag carbon, 1 cup phosgen (2 weeks old), several large fish, live rock, deep sand, corals, xenia. I have been changing 10-15 gallons of water per week for 2 months.
I am connecting a 50...