I'm on day 2 and wow has it cleared up my glass and water! I usually have to clean my glass 1-2 a day and I haven't cleaned it yet since dosing. I've never seen my water so clear either. Too soon to tell if it's having any impact on the dinos (if that's what I have) on my rocks and sand, but the effect on my glass and water is worth it already. How long is the recommended treatment length?