Looks like the plant has stopped complaining. I topped up with RO and CalMag shortly after my original post and the spots have not worsened or spread to any new leaves.

Thanks again for the confirmation stinkyattic
byrdog55 Reviewed by byrdog55 on . Brown Spots near the end of the leaves Hi All, I don't post much, normally I read and search and answer my own questions. This is my second grow(last one was 7 years ago) and have developed an issue with only one of my White Widows almost 5 weeks into veg. Using a Hydro Drip system watering 15 every 2 hours. Please look at the pics and let me know what are your thoughts.....especially stinkyattic My Pics What is your experience level? Novice Rating: 5