Are you giving any nutrients? Are you aware of your run off ph or ppm’s? I would be concerned with the taco leaves on the newer fans, and curling with the older fans.
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What normally causes the taco leaves first time growers thought part of the process? 
Using distilled water every 3 days unless we get rain and using soil with 60 day nutrients mixed
There can be many causes but my first guess would be the ph of the soil. If you are able to check the run off ph next time you water thats a good place to start.
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