All I use is mg organic soil and plant food. Plants are fine and hanvt had any major problem. A yellow leaf every once in a while but thats normal. I always hear horror stories of n00bs trying to get very technical and fail. Im a n00b as well and mg organics has been easy and productive
The problem child is the soil line with synthetic time release nutes. Not the organic line. The slow release synthetic nutes are difficult to manage, release is unpredictable. Flushing of the soil can actually cause excessive fertilizers to be released.