Planted Tank Obsessed
Join Date: Jan 2015
Location: Newmarket, Ontario, Canada
When you use the YANC, and look at the list of premixed ferts, do you see the Tropica fertilizer you purchased?
I see "Tropica Plant Nutrition (TPN)" which has Potassium and many micros, and "Tropica Plant Nutrition+", which is like the former but has nitrates and phosphates.
If it is the TPN, there is 1.13 ppm of K, for each 0.1ppm Fe.
Potassium would be the only fertilizer that might be 'overdosed'.
I would dose KNO3 and KH2PO4 as directed, and dose TPN for Iron as directed, and I wouldn't worry about the excess K for now.
But if what you bought isn't TPN, then you will need to figure out the breakdown of the formula. Cheers.