Fat Banana Auto, it's a giant compared to the others, and it seems very thirsty. 2x1,5L a day in coco, and it dry this evening. But what are the different grayish color on the leafs?
That is purpling. It usually comes from lack of phosphorus. Being too close to the light can cause it too, or very cold nights, and genetics of course. I would add some P. The purple isn't considered a good thing, it can result in less potent buds, but it's not really something to concern you either.