I have Botanicare Pure Blend Pro Grow that I use for my pepper container garden.
It say for hydrogardens, coco, and soil.
It has things like :Fish meal, composted sea bird guano, sea kelp, spirulina, soybean protein extract, rock phosphate, potassium carbonate, magnesium carbonate, calcium carbonate, humic acid*, fulvic acid*, citric acid, raw sugar cane, Agrimineral 72 (silica clay extract), amino acids, B-complex vitamins*, and select botanical plant extracts
Some organic some not.
The question is how does it work? In a hydrogarden that has no soil life, these things are ready for the plant to uptake right out of the bottle.