I'm using brett in secondary for the first time. Do I need to give it extra headspace since it technically will be fermenting again or should I treat it like a normal secondary with minimal headspace?
Thanks in advance!
Minimal headspace is fine. If you let too much O2 in, it just forms a pellicle. It's not going to jump out of the fermenter at this point. It will be a slow slog to get the last few points down.