Or if you have a low tech tank you need the K+
I have low tech and was trying to follow your posted recommendation, so what is K+??
I have algea that won't go away and while I added the excel today and some flourish when I highly cleaned the tank, the algea was back on the plants I just cleaned and the walls within the hour. Granted you can only pick up so much of the mess in the water, but for me the excel seems to turn my water green.