Yeah, 3mL a day isn't much in a 220, but it's better to start low, then slowly increase to allow your tank to adjust. Keep us posted.Long overdue for an update but it has been 30 days since I started dosing. I was out of town for a few weeks so I only dosed 3ml per day in my system which is about 220 total gallons Of actual water. I did not see any results that I could speak of during the first 3 weeks of dosing most likely because I was dosing such a low amount. I have upped the dose to 6ml per day for now and feel that I am starting to see better PE and faster growth in the last week since I upped the dose. I will soon be upping the dose again so I hope to see more results.