Much the same for me, I've only dosed FeEDTA as a micro, and I've used a very small amount of off the shelf "Miracle-Gro" 24-8-16 that I bought remaindered at Wilko's ~3 years ago (warning contains urea), when the Frogbit was looking a bit anaemic.A pinch of KNO3 here and there with a little trace as I see fit plus plenty of fish food... I'm running slowish tanks though