Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
I have dumped the dry ferts in right where the water is most active at the filter outlet. This dissolves the ferts fastest, and spreads it out around the tank while it is still granules, so any one fish is not eating a lot. They do spit it out, as noted above.
However, mostly I pre-mix the dry into the amounts I want to use for a week or more, then dose it in liquid form.