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No fertilizer will repel gnats. Use neem oil as a preventative for pests. Make sure to mix a little bit on dawn dish soap in to function as a surfactant. I would suggest using a nitrogen heavy nutrient. Just remember to use the nute at 1/2 strength of what the label says. You generally want to stay away from granule fertilizer and instead use water soluble fertilizer. I am currently using Fox Farm Grow Big with success. I have also heard good things about Botanicare Pure Blend Pro Grow. And you can never go wrong with organics. Blood meal is a great source of nitrogen.
The directions are stated in the post from Magash if you read the picture. Another good one to use is Suoer Thrive but only use it one time per plant! For more information: http://superthrive.com/mobile/index.html