When you get Tomato blooms, just make sure you shake the heck out of the plant. That is all that is needed to get good pollination. They use a "tomato shaker" in all the green houses down here in FL. Its basically just a vibrating stick that knocks the pollen loose.
I've had good success in the past with 10 gallon floating system "Deep water culture, airstone in the water" for lettuce. Not so great of success with with floating "Kratky method" No pumps, no air, no electric. It worked, but growth was slow, and harvest was also small.
With all the crap and garbage put into commercial foods today, I think everyone should be looking at various ways to produce their own foods. Aquaponics is awesome. Just keep it organic as possible.