Brownish spots showing on leaves

nbgen12

Active Member
Hi all - trying to troubleshoot this issues where small brown spots are showing up on leaves, slowly expanding, and affected leaves feel like they are drying out.

Basic details:
Soil grow using Fox Farm Ocean Forest
Have only used Fox Farm fertilizer one watering about 4 weeks ago (the blend of 3 for the 2nd week of flowering)
Temp is about 70f
Humidity is 39%
Using Spider Farmer LED lights
5 weeks into flowering.

Have been watering regularly, about every 3rd day or so when the soil a few inches deep is starting to feel dry since they are sucking up water pretty quick. Water is tap and have added small amount of sodium ascorbate (help evaporate chlorine/chloramines) and mixing for 24 hours in open container, with just enough white vinegar to bring PH to around 6.6 - 6.8.

I ordered calibration fluid to arrive Saturday before doing anything else to ensure ph meter is accurate. Currently this is my concern that it may not be accurate and locking out calcium and/or magnesium.

Im leaning towards calcium deficiency based on other photos I’ve seen due to possible PH issue (TBD), but any more expert individuals have thoughts?

Plant overall looks healthy, and the other plant I have in there shows no issues. NOTE: This is my second grow, so very new to troubleshooting.
 

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