MAC leaves falling down

Looks to me like a lot of nitrogen there.. Your pictures are dark and a little hard to see.. but if they are glossy.. This is nitrogen excess and is virtually impossible to clear up. why so hard to clear up? well because plants love nitrogen so when they take it in they tend to hold onto it. They love nitro and need it so they don't tend to hold on into. And putting her on nothing but water will most likely just make your plant even more unhappy. If i was you and I thought it was nitrogen excess then I'd be feeding with as little nitrogen as possible but still feeding with smaller doses of bloom nutrients if able.

I’m not sure about your grow environment or watering schedule but it could be a couple different reasons. Wind stress causes leaves to curl and point down. Check the leaves in your plant if they feel to dry it may be because you need to water them more or exactly the opposite if they feel full and heavy then it’s too much water. Possible excess nitrogen if the same leaves start falling off or yellowing then you know. I want to say it’s one of these three probably wind or watering. Hope this helped. Good luck with everything! Happy Growing Cheers!🌱🎄🔥