whats wrong with my plants

lets see i am down to two female plants that are both flowering and they both seem to have brown spots on the leaves. and one also has brown at the very end of the leaf i dont want my babies to die

What are you feeding them? How long into flower are you? Are you growing in soil?

yes i am growing in soil miracle grow. umm thats about it what could it be?

Sounds like you over fertilized them. Mg is really strong. Try using fresh water for the next week or so and cut back on the amount of mg you use. Good luck.