Twojointanswered grow question 6 months ago And also like Organoman said, a little over-feeding looking at the tip-burn but it's not so bad.
The spots and yellowing around it looks to me like a calmag issue, indoor grow with led's always give calmag issues if no extra calmag is given.
I now always give one dose of calmag a week from the start and don't have problems anymore with it.