Leaf tips dry and crumbly

Just wondering if I should be concerned, one plant out of 5 has dried-up leaf tips showing on a couple of fingers.
The plants are regular, 28 day old, CBCOC from Amsterdam MJ seed, not showing yetUploading… Uploading…

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Nutrient burn. back the ppm/economic off a little. They will recover fine once you get the levels in check

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what size pots are they in?? maybe rootbound

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They’re in 5”square 7.5”deep pots, I would be surprised to see them rootbound, but thank you I will check it out