Is this burn or deficiency?

[sourdieselyumyum]

Plant is around day 14 of flower in promix hp. The edges are leaf are slight discolored purple/black look slight curl up. Haven't really been feeding too strong around 500 ppm every water or every other watering. I'm thinking it's burn or build up cause rest of plant is pretty green and healthy looking. Anyone know what this is?

 

[MrGhettoGrower]

I'll would be feeding more like 1200 ppms every other watering 2nd week flowering I doubt it's overfed or burnt at 500 ppms...

 

[ANC]

Those dark streaks look like a collection of excess micronutrients.

 

[thumper60]

Plant is around day 14 of flower in promix hp. The edges are leaf are slight discolored purple/black look slight curl up. Haven't really been feeding too strong around 500 ppm every water or every other watering. I'm thinking it's burn or build up cause rest of plant is pretty green and healthy looking. Anyone know what this is?

check ph of water u using for starters

 

[Roger A. Shrubber]

looks like low rh, and slight overfeeding. think i'd water a little more often, make sure you get a little run off. also make sure you're pots aren't sitting right in the run off, sucking it back up. i'd go to an alternating feed, water, feed schedule, and if you have one, i'd throw a small humidifier in there, at least while the lights are on.
you're ph could be off, which would just aggravate everything else, i'd be ph'ing at 6.3 for pro-mix. have you checked your ph meter recently to see if its accurate? they can drift quite a bit, and .1 point of ph is a ten times change....