Plant problem! Please Help!

What is wrong with these girls?

leaf rust is a common sign of to much nitrogen.
what is your fertilizer and are you adding any nutrients?

CyberSecks said:

leaf rust is a common sign of to much nitrogen.
what is your fertilizer and are you adding any nutrients?

Click to expand...

ahhh that makes a lot of sense, I've been using NSR greenleaves bloom and boost formulas but I've been adding a small amount of fox farms grow big because I had heard a little extra nitrogen during flowering can help. But I guess I've been adding too much. Is the black tip on the second picture the same problem?