Help, burnt tips on littles

so we have soms cbd strains going here, we had to transplant because they where reaching too much, so they are in 2 gallon smart pots, with fox farm ocean mix. I hadn't fed them any nutes yet.. well until a few moments ago because I'm starting to think they needed fed, I water with RO water. But I figured the nutrients in the soil would cover the minerals and crap lacking in the water, we have very nasty water with lots of chemicals etc. Or could this be a light too close. We are vegging at night indoors using LED lights.. which may have been too close... thoughts?
 
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