I have had great results... I underdose and even miss some days. It took a good month before I started seeing any real results. I can see it's working because my chaeto has shrunk more than half. No cyano in the dead spots anymore. I have a problem with sailors eyes and those are almost gone also. It was a slow but steady process.
My tests and even the LFS all showed "0" for nitrates and phosphates as well but obviously they are there. I have tried and tried to find the source...
Did you have an algae problem or did you just decide to start carbon dosing because of its benefits? And what are sailor eyes? I'm doing the minimum doseage as well, so I expected results to be slow but I thought I'd see something.
Is it recommended to keep alk lower while carbon dosing?