There's no tip-burn apparent in the pics. It's not a straight nute burn; rather, it looks like you're locking out calcium and/or potassium. Usual reasons for this are soil that is too wet, too cold, or of too-low pH. If you used a peat-based medium to begin with, as most are, and the plants have been in there a while (like more than a couple months) it's quite likely that the lime is used up and the plants have lost their calcium source and the soil has lost its acid-buffering capacity. Check the pH of the runoff. It's likely low.

On the up side, most of the leaves look great. You may just need to re-pot up to a slightly larger container with some fresh soil. If the soil pH tests low, you'd be well advised to flush it back up to 6.8-7 and stabilize it before repotting. If you're going to do that, wait until the soil dries back out pretty well before actually doing the re-pot.
stinkyattic Reviewed by stinkyattic on . Nute burn? Hey guys, a lil more than 2 weeks in this showed up. Pretty sure thats the first leaf to show these symptoms but other more mature leaves are starting to show the spots as well...Haven't added anything except tap water or water from brita filter. I'm using MG 6 month feed...which I'm beginning to read about and seems this might be the problem..? Thanks for any feedback. Rating: 5