Nitrates have always been 0 for 3 years now. I have a skimmer and a 20 gallon fuge filled with macro.
However PO levels were up around 2 at one time. I had the LFS
test my water for me. I have never had PH
issues until the last year...I have changed nothing as far as my feeding, water changing habits, etc...as a matter of fact I had at one time 6 fish in my 100 gallon and now I only have 3. Feed every other day to every third day. Was using Selcon, vitamin C, Zoe but have stopped this as well. Now I just drop a clip of nori in each day for my tang. My clown and damsel eat it as well so all is well with the feeding.