Planted Tank Enthusiast
Join Date: Apr 2012
Location: Edmonton, Canada
When you add water, use distilled. Leave it overnight and it should be all dissolved by morning. I was dosing a 20 gallon to the recommended levels. I have a T5HO fixture above it as well and running DIY CO2. The algae was getting the better of me. Test your water so you know how much nitrates are sitting in your water, then you'll know how about how much to fertilize. With my fish, and it's not overstocked, I am dosing half the recommended. Before this my nitrates were sky high.
When you dose, do both. I always dosed when I got up in the morning, I would run the lights on a suitable schedule that they were on in the morning for a few hours, then off, and they would come back on later in the day.