04-25-2014, 07:32 PM
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Traces are micros. There are 17 of them, most important is boron, molibden, copper, manganese. Iron is not included in the trace, it is a micro nutrient.
As for the macro, there are three: N (nitrogen), P (phosphorus) K (potassium). They are called macro because plants need them in higher amount then micros. IMO , potassium is the one to supplement, the other two (nitrogen and phosphorus) could be there already from fish (ammonia) and fish food.
I was also told that micros are in the water and a water change will pretty much replace the used ones. I am not convinced. What comes from tap could be very different depending on where you live...
And root tabs are mostly micro (trace). Some have iron.