Leaf discoloration on WW Auto

I have searched and searched and can’t find a pic similar.
I have one White Widow in my tent that has some discoloration.
Kind of like it has bleaching towards white or a lighter green.
Anyway the other 3 plants do not have this. I am using a hydro grow TSW2000 at 24 inches above now, 5 gallon pots, temp between 75 and 80. Humidity 50% PH 6.5

They are currently in week 4…
Note that for first 2 weeks, humidity was much higher 80% +.
Water every other day, no nutrients added. ( but starting to add now)

The plants, even this one, seems healthy but shorter and bushier than some I have seen at the same age.

If you have seen this before let me know.
Thank you in advance!

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Looks to me like an older fan that has some damage to it. Overall plant looks fine.

One suggestion to be cautious of supplements unless you know the runoff TDS of soil.

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Thank you for the info and looking!!!.. I just ordered a TDS meter but not sure how to go about using it yet TBH. I will be looking it up but if you know of where a good listing or How to Guide is that would be much appreciated.

I use a rule of thumb with the TDS meter: in soil I monitor runoff (should be about 20% of pot size) and capture the last 1/4 cup or so to measure. I’m looking for a TDS of around 1,800 to 2,000 ppm as my start point to supplement. In soilless that number is 1,000 ppm. That way you won’t ever nuke your plants if you simply monitor runoff and supplement when it gets to that value. Never mix stronger than about 1,000 ppm.


Thank you so much!!!

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So just feed your plants whenever the runoff ppm is 1,800-2,000?