OK, I'll watch for that. Brown acros! I shudder to think! I've been testing for NO3 and PO4 daily since starting the treatment.Just be sure not to do mistake I did, when algae started to decline I continued to dose KH2PO4 and NaNO3 as usuall. In just 2 days between measurements PO4 spiked to 0,2 and some acros got beautiful brown color
Thanks