300? I would get that up to at least 380ppm quickly, and then slow down to about 10ppm per day. I got down to 310ppm and definitely saw almost no growth until dosing it back up to 400ppm in a few days, and then slowly worked it up to 450-460ppm. Unfortunately, I will just be mostly guessing until Salifert can get more kits produced. I have a test kits that's probably 1/3 used, but now I'm testing far less with no new kits in sight.I was going to do that but I want to be able to dose each one individually. I am using potassium chloride for the K and ammonium bicarbonate to help build up some nitrogen and food in the system. Once I get everything dialed in then I might try potassium nitrate for a maintenance dose.
My K is testing around 300 and NO3 is 0.04. Very low on both. I need to get those up.