Hello Everyone,
Brewed for years, stopped for about five. Made it a priority a week ago, visited Austin Homebrew Supply to buy some piece parts. I walked out with a new FastFerment unit. A AHS German Wheat recipe kit is on day 4. Fermentation slowed then stopped yesterday. Saturday will be the removal of the ball, removal of the trub. I soda keg so another week to keg.
So far I'm loving the FastFerment. Saw a comment about oxidation in reattaching the ball for stage 2.
There should still be a lot of yeast in suspension even after you remove the ball, enough that oxidation probably isn't a huge concern.
You mention that you keg, as a precaution you could purge the ball with CO2 prior to reattaching.
Not oxidation related, but I'd consider waiting a few more days before you remove the bulk of the yeast from the fermentor.