Hello all ! This is my 3rd grow in hydro. I have a homeade circulating system with 6, 5 gallon buckets . I have a new 600 watt mh double ended bulb. My ppms are at 270, ph is at 5.8. I have a fan blowing above them, not directly on them. It’s not too hot on them. All have one to three roots in the water. They are growing pretty good, but my laeves are curling. They’re not changing color, just curling. HELP!
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How close is that MH 600? Looks like some heat issues, what’s your grow space temps and RH 
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24" and it’s in basement so humidity is 85%. Temp is 80.
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Looks like light burn to me either lift ur lights up or turn them down if possible
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Thank you
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Need to know water temperatures, if you have any light leaks, what color the roots are, and how far below the bottom of the net pot your water is. 