1st DWC, Leaf Tips Burning During Flowering

Hey all. Thanks in advance for any help or advice. This is my 2nd grow. 1st time with DWC. Haze strain. Sativa dominant. I flipped the lights to 12/12 about 8 weeks ago. About a week ago the leaf tips began showing signs of burning. Also the veins (if that's what you call em) on some of the leaves on just 1 of the 5 plants have began to brown. I've fed them same as I have been, no changes.


Using:
2 900W LED lamps (about 18 inches away)
4 65W LED providing light on sides
5 gallon buckets (3 gallons of water)
2 airstones each

Nutrients: (All at recommended dose)
GH CaliMagic
GH Micro,Flora, Bloom
GH Flora Nectar
Hydroguard
Great White Mycorrhizae
PH stays fairly steady ~5.8-5.9
I have 2 900w LED grow lights


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