Leaves yellowing, tips and edge burning and strange dot patterns

Hello there. I know exactly what is going on… your soil has become to acidic and most likely ppm is to high…. Just run a few gallons of plain tap water thru the soil. Also it’s about time you start to dial back the bloom nutrients and make sure you are still giving micro nutrients Do not worry to much your plant is in the final strech. It’s almost impossible to kill your plant at this point. It’s ok if it starts to look ugly the last 2 weeks or so

looks like K excess

It's too much nutrients (PK) most likely your substrate is saturated with nutes, if using liquid nutes it's important to use only water every 3 feeds or so to help get rid of some of the unwanted salt build up. It's also important to be checking your ph is in the correct range otherwise some nutes will be " locked out".

hey 👋 At the end of the run, reduce the nutrient doses, but I think it's more likely to be a blockage. Are you using CalMag? If not, add 3ml/L as a shock dose, then go back to 2ml if the new leaves are healthy. Also remember to check your pH, it's probably too high. You just need to hold out until the flush in 10-15 days 👍