According to the dosing instructions on Dr Foster and Smith:
"To target a specific nitrogen increase, dose according to the following formula: 0.25vn=m, where v= volume of tank in gallons*, n=desired nitrogen increase (if using a "nitrate equivalent" value for "n" then use a factor of 0.05 instead of 0.25 in the formula) and m=volume of product to use in mL. For example, to raise 20 gallons* by 0.20 mg/L nitrogen, you would use: 0.25*20*0.20=1 mL.
Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading."
So, according to the equation above dosing 3 caps full (15 ml) would raise the nitrogen in 10 gallons by 6 ppm. This seems fairly harmless.
And going by this statement: "Because one-half of the nitrogen in Flourish Nitrogen™ is from nitrate you can get a reasonable estimate of nitrogen levels by doubling a nitrate reading." One would expect to see only a 3 ppm nitrate increase.
However, if you use 0.05 instead of 0.25 (for nitrate equivalent, see instructions above), the nitrate increase is 30 ppm (maybe not so harmless).
Something doesn't seem correct with these instructions.
Anybody have an opinion on this?