Phragmipedium Nicolle Tower purplish blotching help

[JennyNE]

So I wish I knew how many parts of N. But again I’m new and just figuring this out. I use a TDS meter and after adding the RePot Me MSU fert I it reads about 120ppm. Then I add about 30ppm general hydroponics calmag. I’m about done with the repot me fert and won’t be buying more. My next goal is to really figure out how to better measure fertilizer. But I also worry I’m not giving enough. Since I posted my first post a second bud is about to open and I got one bottom leaf with a little browning on the leaf tip. And both bottom leaves look a little yellow. But just slightly.