Fan leaves Browning and yellowing at top

[Basshead]

It's critical purple auto flowr from growers choice

 

[Waira]

Bass, didn't she come in before? This looks familiar,.... those are some funky symptoms! I think this is mostly a weird manifestation of Ca defc., being upper most affected (Ca is poorly mobile within the plant, difficult to move from establish tissues to new growth),.... but the margin frying looks like K defc.,.. very odd place to see it, K is fully mobile so lowers/mids usually are hit first and worst,.. how close are the lights, this has a "proximity" problem feel to it,..? Sooo, what dosage/frequency of the Tiger are you doing? ...only other thing I can suspect is a micronutrient defc., but these symtpoms are a poor match for them, except being focused on the upper most areas (most of the micronutes are immobile),....
Also, when crap like this hit this hard, it's time to check that in-pot pH, run-off readings are all but useless generally,.... Point is, it helps determine if you have a pH lock-out situation, or a plain lack-of thing.... Do yourself a huge favor, get an Accurate 8 soil pH probe, a great value product- hsoil: <-- long probe here is the A8...

 

[Basshead]

I did not follow a dosage chart by fox farms and I only gave tiger bloom every other feeding and started it really late in flowering I had no idea what I was doing it with it this time im.going to start dosing it at five weeks and giving it two tea spoons instead of half a tea spoon and i.gave it no Cal mag until the end because I didn't take that part seriously I've learned or since then

 

[Basshead]

I pulled that plant i got the buds curing now and i got more then I thought

 

[Waira]

niiiiice .... way to gut it out mate, those are fine looking buds! Amazing how much better they look after all the manky leaves are removed, right?

 

[Basshead]

Yeah it is it's fucking crazy I got my second going already I'm going to kill this one I have more of an idea of what im doing now