These are Frisian Dew plants from Dutch Passion. Same soil, same routine (Feeding, watering, light etc...). The one on the right has a sort of lemon green colour and is seemingly unaffected by the high 80s temperatures, while the others are wilting and have a dark green colour. I'm worried that the lemon green plant may be potassium or nitrogen deficient, but it seems otherwise healthy and just as big as others. Any thoughts on this? Should I be concerned?