Help me please, few spotting cracking leaves

I am about 5 weeks into my 10 plant grow and ive started to see that a few of the leaves on the best budding plant i have are slowly cracking on the tips of the leaves and slightly getting discolored on some of the leaves all around it, I figure it may either be due to nute burn or maby underwatering but not sure...they arent real bad or anything but just puttin it out there for tips. Thank You

Looks like a bit of nute burn, nothing to worry about, just water on next feed an see if she is ok, providing new growth is okay I wouldn't worry about it, cut back on the nutes a touch and slowly build it back up.

Thank you for the input