Yes, the readable phosphates level happens I'ma bell curve. You will get 0.00 phosphate reading if your cyano is using all the phosphates in the water column. It's is important to catch phosphate spike before the algae show up.
Question. My 300 gallon tank has been setup for 6 months. I have 200Lbs of live rock and a ton of bio brick in the sump. I have 15 5+inch fish that are fat and healthy... My Phosphates have gone all the way up to .5 and and nitrates are always 0.... I got the Phos down to .1, but I still cannot grow Macro algae in the refugium.... What am I doing wrong? I feed heavily but the nitrate is 0 and Phos increases....
