Only confusion I have with it being potassium is that the leaves showing the yellowing are the older mature leaves, while the article suggests potassium would show on newly formed ones.
I'm leaning towards Nitrogen right now, perhaps fish emulsion isn't providing enough or I should've fed them more regularly.
Thanks a lot for the article, good resource.
CURRENTLY IN BOTTLES -- Black & Blue Amber Ale
FUTURE BREWS -- DFH 90 Minute, Flying Dog Raging Bitch CYBI clone, Rye Saison