I am starting a 3.7 gallon tank, and am unsure as to how to fertilize it. The Seachem chart at the top of this page wants me to dose 0.2 mL at a time, how do i do this, by drops, by pippetes, or some other way?
Dosing small aquariums is easy. For example PPS-Pro fertilizing dose is 1 ml per 10 gallon or 40 liters a day. For your 3.7 gallon aquarium the dose would be 7 drops a day solution #1 and #2. To do this you can get an eye dropper from your local drug store or pharmacy.
Edwards recommendation was 7 drops per day of PPS solution, so he wasn't saying 7 drops equals 1 mL, he was giving you specific PPS dosing instructions.
20 drops equals 1 mL. From there, you can figure out the dosing according to your SeaChem products or whatever products you are using.
I highly recommend buying dry ferts. They are so much cheaper, and really easy to put together. For large tanks, you can just dose dry, but for small tanks you can make a solution. It's easy, I promise.