Still more white tips on new growth and now yellow dots on older lower fan leaves

You've gotten plenty of suggestions so i'm just going to talk about proper perspective on things... several different things can cause just about any symptom you can see, so more info is needed to make more confident diagnoses. visible symptoms are indiscrete. If you rely on them alone, you are bound to make many mistakes reacting to fix them. Basically, it's playing russian roulette to take that sort of approach. also important to note that things happen over time. what you did yesterday or even last week may not be the cause of what you see today. a change you make today may take several weeks to have a visible effect on the plant. You need to broaden your gaze when trying to figure out the cause of any problem... migh need to look back as far as day 1 in some cases. happening lower on the plant means it is a 'more' mobile nutrient. this is a spectrum not a on/off characteristic of each element of nutrition needed. It could also just be an older, shaded leaf that is still value-added, but maintenance of that leaf tails off a bit as the plant focuses more on leaves not heavily shielded -- do not remove such a leaf, it is still doing useful things, like transpiring, which is one of the most important functions right up there with photosynthesis.. carbon is your limiting factor more times than not. The 'best' formula can vary based on environmental factors - from climate to light provided. The numerous relationships between the nutrient elements allows for many ways to skin the cat, even if a few are more optimal than others, you can keep plants healthy with a wide variety of ratios and concentrations, but a few formulas will work better across wider range of genotypes. So, just because soemthing works one times doesn't gaurantee it works another. Many factors are relative and need to be considered. Any time it seems whimsical or random, there is a good reason for the deviation, regardless of whether you notice it or not. always look to blame our own behaviours, because the plant is not responsible for anything, lol. we provide, it either reacts well or does not. it's never the plant's fault.

This is not a criticism so please don't take it as such. Your plant is or was healthy and vibrant but it's small for 4 weeks comparatively. Tells me transpiration is low, direct flow of water is responsible for nutrient uptake from medium, the demand is set by light intensity and environment. What goes in must come out. Your soil doesn't store much nutrients. 98% of mineral elements are taken up by roots directly from water solution. Once roots takes them from water solution only then will soil replace with minerals from the soil if it has the capacity to do so. Essentially you are applying a template of salt minerals to a medium which best fits the growth stage your plant is at. When you feed more salts than the plant is using the medium will increase in salinity or salt. Salt is very powerful and when the salt gets too much in the medium electrical conductivity will rise. Denser, high-salinity water sinks while less dense, lower-salinity water rises. Hence if soil becomes too salty it essentially counteracts the plant trying to uptake causing tips appear to burn when infact moisture is being drawn or prevented from flowing. You need to leech water from your pot until ec becomes normal level then reapply correct fertilizer for stge of growth. Water water water untill ec drops, reapply. A little high is 👍. Think of it like stress. A little is ok but need to be considered with stress as a whole. Best of luck.

Most probably potassium deficiency or salt build up , ph swing and aftermath from that, aka uptake issues. Would not stress yet. Half strength of fox farm trio was always enough for me in soil grows with every second watering going as feeding. There could be many reasons, even watering habbits could lead to unhealthy plant. Rethink is everything on point.

Hi bud. There have been quite a couple suggestions made over the past year. Have you followed them up? It might be normal that the older leaves are still being affected, as long as the newer growth doesn't show it. Damage that is already done is permanent. Hope this helps, even just a little.