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It looks like burning from over feeding to me. Remember, what is showing in the leaves now, is a direct reflection of what was happening in the root zone 2-3 weeks ago, meaning one watering and a couple of days will not stop it. Symptoms will not stop appearing for at least 2 weeks once you stop over feeding. If you are growing in soil, I would suggest no more than half strength nutrients every 5-7 days until the problem goes away. In soil, a schedule of plain water/plain water/fertilizer is what I have found to work the best. Never fertilize every time you irrigate!

More than one thing can show those types of symptoms, so leaf symptoms alone are not enough information. too much p or k cna burn the serated tips and cause chlorosis up top... low k and a couple trace element deficiencies can, too... so it's not even overty a deficiency or a toxicity, necessarily, judging by leaf symptoms alone. Level of fertilzation an dfamiliarity with the soil used can go a long way to diagnose more accurately. It's common for people to bomb the shit out of the plant with p/k in flower.. if yo made these sort of adjustments and within 1-2 weeks you saw these symptoms, i'd revert those changes. as is, not enough info. there are some signs of slight over feeding - lush and maybe start of tip curl. But, that doesn't mean some other portion of the formula provided is lacking, either. dont throw 'everything' at it... deduce 1 path and see how it goes. worst thing that happens is you learn what it is not. if you do too many things in reaction, you wont learn which helped or hurt. rate of change is the key to focus on. if damage stops, that's obviously a positive response to whatever you did. it wont heal the crispy stuff, but chlorosis can reverse and fill back in a proper color. just don't expect things to happen overnight fertilization is a culmination of everything you've done since the start.. how heavy you feed early impacts needs later. The optimal way to provide nutes is maintaining a proper level of all nute around the roots that does not impede each other and gives the plant access to all it needs. the plant sends out carrier molecules to grab what it needs as it needs it. The ratio around the roots has nothing to do with ratio of use in the plant -- two different things.