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Seif you hit the mark because 1.9 is a bit high for the transition phase or in any case it is also high for the growth phase for this height from the plant so you didn't do anything special because it's still high but not So, yes, be careful with nitrogen and fertilizers, it's best to always stay below one. I'm trying to do the full cycle by watering with a maximum of 1.5 and I oscillate between watering only calmly.nitrogen fertilization if you do not have a light or coconut or totally inert soil is very mild only if you see a nitrogen deficiency then add it because nitrogen is very difficult to be that it is lacking if you use any soil even slightly fertilized especially in the first few weeks so yes at most only with osmosis water and a little calcium and magnesium if you want you can also just water with osmosis water and bring it with tap water to 100 PPM if you want to clean instead if you want to clean the soil, water it with osmosis water Always remember that the apex of the plant must not have the same dark color as the old leaves, this is a very important rule.If you see that the apex is too dark, do not fertilize, water as if it were rainwater.and the rainwater load guys is about 10 20 PPM

it appears to be a slight tip discoloration, usually due to nutrient overload. This is a very healthy lady. Perhaps let it dry out and make the next watering w/o nutrients. She will get back on track!

Think of it more like a "salt capacity" Guides for fertilization are based on average expectations. But the rate at which a plant needs fertilized can sometimes be faster or slower depending on how growth goes. If you happen to fertilize faster than the plant can use the salts then ec will rise. If you happen to fertilize slower than the plant can use the salts then ec will drop. With some understanding you can measure the water prior to going in and you can measure the run off coming out. From these you can get an idea of what's going on. There Isa useful way though but it requires a ec metre made specifically for soils. Using this.you can take real time readings of ec levels. This really helps the grower know when to water, when to fertilize and most importantly when not to ferti. Your plants look good just a little high on the salt capacity for the plants size, you want her around 1.1 -1.5ms/cm for current size at most. The high ec might cause a slight disruption but she should bounce back to normal soon once she eats up some salts after a couple cycles. Remember ec requires water and salt to measure so if you are doing soil you need to make sure reading are taken always after watering around 10 mind later to keep consistent readings. Or you could flush to reduce but that would depend on orga oc or synthetics feeding program. Good luck.

Not to worry it's a slight burn, give a small dose of feed also give only water this time with reduced next time.. Plant looks solid 👍✌️💚