Thanks for checking in, @jingo ! Yeah, that one has always been weird, but curious to grow it out. One of tje critical purples is a bit more sensitive to the nutes, and shows it, but is growing well. Cut her off of optic foliar completely, but she gets the same mix as her sisters when feeding.All but one of your plants are looking great and that one isn't terrible. You can probably nail that pattern down to something along the lines of sulfur or magnesium deficiency. Hard to say without whole lot of diagnostic facts.