A 1/2 teaspoon is good for 5 gal, but what if your staggering the nutrients would you put the 1/2 teaspoon each time or split that 1/2 teaspoon up over the course of the additions?
I had the same thing happen with my first mead, fatbloke said the smell comes from yeast stress and recommended i added yeast nutrient. The smell went away after a good stirring and added yeast nutrient
From what i understand if your trying to make a mead your better off without that, meads should be natural as possible. unless you really want a clear drink right away, i would just rerack into a second carboy or even a third.
I looked it up as soon as i asked him what it meant, fatblokes just been adding a lot to this thread and I wanted to see what else i could get out of him, you can't find everything on the internet