Sorry let me clarify something, when I said, "Your plants will adapt to the growing environment by making larger type leaves to deal with larger amounts of humidity/heat and produce thinner leaves for lower humidity so if your plants have been brought up in one type of humidity then a change will have those kind of affects." I am , I mint if they were grown out for a long time under low RH then you give them high RH they may show the droopiness because they haven't grown in a way to adapt to that type of humidity.
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