Trying to find the balance for a variety of strains...

I have a 6 different strains in the same room each doing there thing in the same soil (miracle grow) and add here and there some Earth Juice products. Learning the balance of nutrients seems to be a little more science than planned for, Is it that difficult? This is my second time 'round and they seem to be producing but the Ph or others things may not be right.

I have always held the position that some different strains have a higher tolerance before they experience "Nute Burn". But basically, thier requirements for nutrients are pretty much the same. I don't have anything to quote on this matter - just my own experience!

Not sure if that's what your looking for, just my $.02 worth!