It does look like a lot of headspace but it also looks like it's in primary so hopefully its pumping out CO2 which should protect it somewhat. I'd move to secondary just before the ferment is done and use a much smaller vessel.
Daydreaming about......raspberry vanilla, wildberry mead
Brewing & Aging: Wildflower mead, Betrayal: A Stark Raving Cherry Mead
Bottled: sweet blueberry melomel, sparkling Cranberry/Blackberry melomel, fb apple cyser, wine, wine and more wine!