My dry ferts for EI are on order, who knows when they'll show up. I'm currently dosing Tetra FloraPride and Nutrafin Plant Gro, which from what I can tell has at least the micros and potassium. The substrate is Laterite, which, from what I've gathered, has iron. Between the pride and plant gro, I might actually have reached saturation with what ever iron chelate is introduced. Neither bottle indicates what the iron is chelated with, if they're both chelated with EDTA, it could be that the water just won't hold any more.