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Within reason, I wouldn't consider humidity to be too much of a problem. Too much moisture late in flower can cause mold and budrot and too little moisture just means you'll have to water more frequently. During winter months I would frequently have humidity down in the 20s and it never cause me any problems other than having to keep a better eye on watering. Like anony eluded to, I would say your problem is due to something other than humidity. Don't know where you are located, but if you have access to Walmart they usually have PH test kits in the fish supples for about $5. If your PH isn't relatively consistant, you can have all kinds of problems with deficiencies.
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