I have one too. Love it.
Mine read 0.00 and don't run GFO. Have Chaeto in fuge, which grows moderately, no nuisance algae in the main tank.
I do daily water changes of 1.5G though. Total volume around 130G.
I tested a friends SPS tank and his read .28! Stuff is growing, but some of it is brown. He has a heavy bioload, too. He has a 90G tank.
Mine read 0.00 and don't run GFO. Have Chaeto in fuge, which grows moderately, no nuisance algae in the main tank.
I do daily water changes of 1.5G though. Total volume around 130G.
I tested a friends SPS tank and his read .28! Stuff is growing, but some of it is brown. He has a heavy bioload, too. He has a 90G tank.