Leaf tips brown to white?

Week 7 of flower one of my plants has its leaf tips extremely pale/whiteish. I thought it was nute burn at first? Growing in soil with Gaia green.. all other plants look great this was one from clone the rest were seed.. the plant still producing plenty of buds they are lower trich content compared to the rest.. just wondering if this could maybe be K def.?? Last
Feed was 70/30 power bloom - all purpose at week 6

Close up on leaf

Boston Brian said:

Close up on leaf

Click to expand...

Ph? Calibrated meter or drops?

I always water at 6.4ish with my blue lab meter.. have 2 a soil one and the regular feed one both calibrated weekly only this one plant showing these signs it’s the only one from clone I got going the rest seed.

Week 7 of flower is today. Not sure if the plant was looking for more of somthing? Or the Gaia green diddnt agree this last feed? She’s always kinda been a hungry plant keeping her green and lush was a pain this run compared to the rest.. she would get green then fade then bounce back and fade.. pull hair out over this.. thinking it’s my water and its too hard.. and since I barley water until runoff since I’m organic I don’t flush out the residue.. for example if I use my tap water in a humidifier EVERYTHING gets a white powder coating from the water it’s gross..BUT why would only this one plant do this.. lol ughh drives me
Nuts!