Wow! I'm in such demand!
Tropica Master grow "fertilizer for aquarium plants"
Flora APM- Advanced Plant Management
Comprehensive Plan Supplement
SeaChem Comp. PLant Supp. is the same as your Tropica master grow. So put one in the closet, and stick to dosing 1 product until it's gone..then use up the other bottle (or return the extra if it hasn't been opened yet).
And Flora APM appears to be some kind of algacide...so I wouldn't use it...ever. (return for credit)
So that leaves us with Nitrogen, Phosphorus, Potassium, and a comprehensive mix. Not a bad start, as the SeaChem line is quality stuff...but a little on the weak side for a large, high light tank like my 75. But they are still great for beginners.
You can actually overdose potassium, but its negative side effect is causing calcium uptake problems...not algae. 20ppm is the most potassium you should need...but I feel that anywhere from 10-15ppm is plenty.
But, the big question here is: light levels? I see you're injecting CO2
...so I'm assuming that means you've got at least 2 watts per gallon. However, what size is the tank?
Basically, treat your comprehensive fert as a trace...and since you don't have SeaChem Iron, your comp. fert will be your only source of iron. Dose it per the label instructions at first. After a few weeks, try increasing the dose a little. When you see green spot algae on the glass, you've crossed the threshold and should tone back the dosing.
Also, Eco complete, by itself, isn't a fertilized plant substrate. What it DOES do is hold nutrients (from decayed fish waste) in the substrate for the plant roots to easily access and feed.