Deficiency

Good old canna, I love that stuff. Grew up on it. Id slightly increase feedings as long as everything else is good. If ph is all right then you could bump the feedings up a lil in strength, or I prefer to feed more often with weaker nutes, less likely to burn stuff that way. They look good other wise, Now canna is great for soil and coco as it has extra Cal to make up for coco's ability to take it up and hold onto it. as long as your ph is ok, you should be fine if you just feed a lil bit more or a lil bit more often. Your girls are hungry and this is the perfect time to up their feedings a lil.