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Asking your advice on yellowing leaves



I've had a look at the photo on this site, showing all the different leaf deficiencies, but I cant seem to find this one - Hoping I can get some advice as to what the problem may be for these:




Most of the leaves are ok, but the yellowing is starting to spread.


They are on 20/4, with temps around 20 night, and 25-30 day.


To control humidity, I am having to switch my extraction off for hours of time occasionally to keep humidity at about 50-60. I wondered whether it is better to get day temps at 23 running at 20-30% humidity or have less extraction, and run at 29 degrees with around 50-60% RH?


Appreciate any advice 

Thanks in advance




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