Nutrient help and sex identification

I’m growing 5 plant with humbolt secret base A-B I flushed my plants after the 3rd feed pictures below also if you can help tell the males apart that’s be awesome

Too soon.

drsaltzman said:

Too soon.

Click to expand...

Any idea on the cause of the leaf droop and curl? I flushed 3 days ago and watered again last night with no results

Need more info. Temps, RH, Nutes, Medium etc...

65-70 Fahrenheit 49.7 hun bolt secret soil water every 2 days or when dry. No over watering flushing after every other feed