Yellow tip week 5 day 5. Per flowering week 1 day 5

mutliple things cause tip burn - both deficiency and toxicity. The primary thing to watch is teh rate of progression. If it burns a few tips and nothing else happens, no big deal. I'd wait for symptoms to become more obvious before throwing darts blindly trying to fix a likely minor issue and causing a larger issue. i disagree about the difficulty of keeping a plant healthy throughout most of flower. It's quite easy in soilless/hydro because you have absolute control over what goes into the substrate... if people are too lazy to calculate it and track it, that's more of a self-inflicted problem than anything else. Even with soil you should get "there" with trial and error. Any change in soil or amendments will require an adjustment to fertilization procedure. ratio and concentration are important. Some ratios of nutes can work on some plant, but only good ratios work on 90-99% of plants. Proof is in the pudding. the biggest reason people have shitty canopies in flower is the refusal to accept that whatever gimmick they subscribe to is not related to causality. Someone that burns their canopies often but refuses to accept that boosting P/K is likely the cause of it, for example. Well, if you keep doing the same thigns and expect different resultt, that's the definitiion of insanity. "It's got electrolytes; it's what plants crave!" -- this is why most growers have consistent issues and contantly fighting a battle with healthy plants. this should be one of the easiest things to accomplish once you have a little experience under your belt. There is a learning curve, and if you approach it systematically, it'll be easy for you to evolve.

Plants look really healthy! It’s a good thing you have spotted that sooner rather than later. The tips getting burned will end up going brown and crispy if not solved and spread throughout the plant. excessive nutrient levels, such as high levels of salts or phosphorus can cause leaf burn and brown tips. nitrogen deficiency can also lead to overall leaf discoloration including browning tips. Have you changed anything recently as they look like they have been really healthy up until now ,it looks like nutrient burn to me?

Your plants look perfectly fine. They are going into flower. It is possible they had a very slight nutrient burn (with a mobile nutrient as it appears on the top). All things considered, you have nothing to worry about and your plant is perfectly healthy. I would like you go to to any of the top 100 growers, check out their plants, and go through their flowering cycle of their plants. It is VERY VERY difficult to have 100% healthy plants all the way. So many various factors, and unless you're industrial and have everything super redundant and identical, you will almost always have strains/genetics that act out, ect. You don't have to take my word on it, just youtube some more credible people. I suggest Dr Bruce Bugbee or Harley Smith