Looks like Papaya went into phosphorous deficit. I think it because of bad coco buffering. I forgot about pH level when I was buffering coco with CalMag. I'm working on pH regulation and deficit fix.
@Falc212, So sorry but we haven't anything like this. Keep in mind autoflowers need the same, the only important thing is the plant start to flower at 3 or 4 week. If you use a complete soil, you probably don't need vegetative fertilisers. Only something for the roots.