Discolored leaf edges with few burnt tips Deficancy? Nuit. Burn?

Holy cow I was looking for a 1-2 word answer "mag def" or "nuit. Burn" haha. Thank you to all who gave quick responses I beleive i got my answer plus a few extra bits that i need to start considering. As i learn more about these dry top dress amendments I can narrow down what I need and not what I think I should put on them. Thanks again everybody.

Any chance of windburn? I had similar issues and it took me forever to figure out what it was. Good luck!

if that's not a "hydro" nute line, you very well may need other things... you are in coco.. so you want to provide the necessary elements on demand with each irrigation + 10-15% runoff to maintain concentrations and pH. It should also list trace elements like Fe, Cu, Mo, etc... because coco has nothing to provide if it is well rinsed and buffered properly. some manufacturers are better than others... it's hard to to know for certain based on information in your diaries and here. if comfortable with some basic math, look up how to calculate ppm from guaranteed analysis labels. you can also find nutrient ppm calculators through google. https://manicbotanix.com/calculators/ppm-in-solution-calc.php compare results to my table in any of my diaries (or values just below). Ca, Mg, and S will be different depending on tap water used. i have hard water, so you may need more of any 1 of those on average than what i use. n/p/k 120s 50s 190s Ca/Mg/S 100 85 110 Stick to 650-750 total ppm from fertilizer labels and dose -- the NPK values won't need adjusting very often. The other 3 like i said depends greatly on water you use to mix nutrients. Think i'm higher than what is listed in diaries.. 675ish? my hard water may get in the way of gassing it on the nutes - not sure, but don't go much over 750ppm. if you are WAY off on any of these ballpark figures, you can assume that's the cause. Soilless/hydro is easy-peasy to react to leaf symptoms, if you know what you are feeding. If you don't it's just a guess at best... good nute line for coco should have good pH without extra shit needed to balance it out and a well-rounded / complete diet. It should be fed every single time you irrigate with 10-15% runoff. It is never "hot" nor "weak." it simply maintains an extremely fertile/safe substrate at proper pH similar to the best fields in the world. you control how much the plant uptakes by controlling factors that impact transpiration, namely temperature (a friend is always quick to remind that the important value is the temperature at the leaf, not room/tent temp) and relative humidity %.... if you get to that level of control... it is surprisingly more uniform what plants like than most are lead to believe. you don't need a massive shift in nutrients for bloom phase, either. can some boost to p or k help or maybe some hormones? sure.. but there better be a proper study with a control group to prove the benefit or it's much more likely to be "snake oil."