Airstones don't provide the best lift, I would suggest a powerhead, much more flow. UGFs are actually almost as fry friendly as sponges, I have never seen a fish caught in the tube, and I've been using them over 30 years. Intake is spread out through the gravel, so there's no centralized "pull" for the intake, it quite diffuse, much the same as a sponge.
Unless it's like three gallons or smaller, I would definitely recommend a powerhead rather than an airstone. If you stick with the airstone, change it every month or two, they eventually clog and many unclogging methods tend to disintegrate the stone, lol.
EDIT: D'oh! Just found your other post. Airstone will lift fine for that setup. Like Wolfie said, the bubbles pull the water up with them.