Bumnog
Member
I'm no expert, but from what I've read/seen, and looking at your pics, it doesn't look like mag deficiency to me. I would think the plants are too young, and the burned edges too prominent for that to be the case.So how sure are we that this is burn. Someone ekse mentioned mag deficiency because of the curled up edges and the veins are fairly dark green with yellowing in between
Again, for what it's worth, I think this is nute burn. A gental flushing followed by a couple weeks without nutes might do the trick.
I hope this helps, and here's wishing you best of luck with your plants.