my alkalinity hit a low 6.0 a couple weeks ago.
thinking it might have been my salifert test kit, i decided to buy a hanna.
i tested that and the readings were the same. i decided to raise the alkalinity by .50dkh each day till i hit the 9.0 that i desired. i hit that parameter a few days back. been testing each night and the level has not seemed to drop. i will keep an eye on it. whoda thought, dosing actually worked!! (as some may have ready from my posts, this was a fail for me in my last tank. i was glad to see my numbers change for the good).
at the same time, the cyano has finally went away, it took a few months. although it's almost gone now, i do have some thick red algae on the rocks. none of my cuc's are touching it. the only thing im thinking to help it, could be to monitor the phosphate levels. I was trying to accomplish that using the salifert test. i was GUESSING that the color output was .25ppm , or close to. again, i broke down and bought a hanna checker for this. i felt a little better about it since it has a digital output. tested the phosphates last night and they are reading .25 as well. so my eyes wern't failing me!
i think it might be time to take out a second mortgage and buy a container of high capacity GFO. see if that helps.