Personally, I wouldn't use any fertilizers that weren't specifically designed for hydroponics on a hydroponic plant.
Check the yellowpages, depending on where you live their may be a hydroponic store in your area, call them up and see what they recommend. They will have hydroponic plant food specifically for edible plants.
Otherwise, just take the basil, grind it up with some garlic olive oil and pine nuts and voila - delicious pesto
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