Alright everyone this might be nothing but my leaves are curly a bit is this a problem if so how do I fix it? 
I’ve read curly leaves somewhere so that’s why I’m asking until I find the book.
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What’s the temp been like? Have you lowered the light recently?
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How’s your Relative humidity as well.
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Yes I lowered the lights and have just highered them. It’s LED lights so didn’t think they’d over heat if that’s what you’re saying, is it?
They’ve grown now so I’ve highered the light.
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With leds it’s harder to overheat but the intensity can still be too much sometimes. Whenever you lower the light watch for any changes. Leaves usually point to problems so watch for it.
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Alright mate what’s should it be?
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Humidity should be whatever your temperature dictates. Or vice versa, whichever is easier for your situation. Consult the VPD chart below 
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Thanks mate.
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Would anyone recommend a good room heater and humidifier please?
If there’s such thing as both in one what is it?