Autoflowers

I went of with a good start. Plant started growing nicely, about 20 cm each week. But then suddenly the leaves started to hang. I didn't know what I was doing wrong, to much water, to less water? The solution was putting the plant dry for a day or 2 and then giving a cocktail of bloom boost and pk13/14. After 3 days the leaves started lifting up again, and the plant looked stronger. So then the rest of the bloom the plant didn't show any other troubles.