Doohan:
WRT aeration, take a look at the recent (March 2006) posts in
When to Quit where we have been discussing this matter. My water temps have been inching up despite the cold nights and are just passed 50 deg F at the surface. I think it's time for me to move the airstone back to deep water for the warm months. It's likely a good time for you to restart as well.
If your BG are starting to eat, I'd start feeding again. Just keep an eye on how much they consume to prevent having wasted feed lowering water quality rather than putting weight on the fish.