I have a stainless steel vessel that I use as a fermenter. It started life as a small process vessel for pancake batter but I re-purposed it because it has a shallow conical bottom. The thing is, it could hold about 13 gallons to the brim and I only use it (currently) for 5 gal batches. It has a lid of sorts and I can seal it well enough to get airlock activity, but I am concerned about the volume of headspace in there after the primary activity is complete.
Should I be?
Should I be?