I am doing it the cheap way. I have a medical oxygen tank and regulator and a micro defusion stone. Works like an aerator just uses pure oxygen.
The guys I have seen using it have the most lively fish I have ever seen.
Man it is bad when you see those fish released from a tournament floating.
Since my livewell is a piece of crap I use a 150 quart cooler like Rock said.
Anybody else out there done this oxygen thing?

