i actually have that same $99 cabinet in my garage, but it's full of tools, sodas, and whatever my wife finds on sale.
two things come to mind.
1. early you said u would set the air stones on the same timer as the lights. i think the gurus would tell you to let the bubbles blow 24/7. in this particular case oxygen and light don't interact.
2. interesting placement of the stones. you may be thinking the bubbles carry O2 to the roots. they don't. bubbles pop at the surface and send a tiny droplet of h2o into the air, where it collects some air before falling back into the resivoir. this makes the water rich in oxygen. notice that the pros say the net pots bottom should be about an inch above the water surface. this lets the tiny droplet grab some air, then land on the roots instead of falling right back. the roots stay wet, but it's ok because the water is so full of o2.
however, the way yours are, i would think it might achieve the same purpose as running a hydro line to the cube in other set ups.
and i have a hunch they may provide a service for the girls, acting as a vibrator of sorts, messaging that certain spot. very happy plants.
good luck with the flowers and the next time, and when it comes, you have experience to make it even better.
