Our soil-less pods are designed to be less attractive to flies than traditional potting soil, however, if you put the AVA Byte near an existing attractant, there may be some crossover. Fungus gnats are attracted to fungus and microbes; with your current materials, you can try using hydrogen peroxide to sanitize your device first, let it dry, and then grow your seeds in it.
Fun plant fact: Did you know that chives are a natural pest repellent? Plant some of those in your Byte and see how they run (well, fly).