First Time Auto Flower Grow w/ 3 diff st

As I posted prior to this update, the blueberry has been harvested and now the grow room is down to three girls (2x amensia, 1x sweet cream) which is definitely a good thing since it was getting a bit overcrowded with 4. Amnesias are moving along nicely, while the sweet cream is taking its time and maturing pretty slowly. I can see it taking atleast a week or two more than the amnesias come harvest time. Only Issue I ran into this week is a fair amount of rust spotted fan leaves on one of the amensais. I believe it’s either a mag deficiency or ph issues. Gave it some CalMag so hopefully that fixes it, and also ordered pH meter to use for waterings. Been using the mad farmer kit for adjusting the pH since I began growing indoors but as time goes on the more I start to think it isn’t as accurate as it seems. Other the calmag doss this week I’ve began to cut out all nutes and only feed the girls plain ph’d water with harvest approaching.