I hear of lots of mg deficiencies when people use bio bizz, I have seen decent results out of it though, because that is what bigbud uses and his plants look really good.
I have used earth juice as an organic nutrient in hyrdo though, I still have a bottle of the grow but it doesnt react well with rockwool, too much nutrient remains in the rockwool and it turns all water muddy brown. However in soil or dwc I am sure that it would be really good, after the grow i am on now, i will be putting earth juice into all my dwc systems.