Ok thanks - I got some Plant GRO iron enriched fert with a CO2 system today (contains nitrogen, chelated iron, chelated and soluble manganese, chelated zinc, chelated copper and chelated molybdate. Also wondering if root tabs are any good
George Farmer said:
It's ok for slower growing set ups that aren't too demanding of nutrients.
It only contains potassium and iron, so in more demanding set ups i.e. with higher light and CO2, you may experience deficiencies.