help with flowering leaves

ok, so here's 2 pics of my ladies, about 4.5 weeks into flowering right now. all of a sudden over the thanksgiving weekend the leaves on one are starting to turn a light green/yellow on the tips. the other is getting yellow spots all over turning into brown spots and then the leaf begins to wilt and die. anyone got any idea what this might be/how to fix it if it's not normal? any help would be appreciated.

What is your ph?

the plant problem forum can help some.. look at pics people post, one of my plants had two leaves with lots of yellow specs and i was told chem burn. prob the MC i used to feed. as to yellowed around the edges can be alot but mine did it because of heat stress (look at gallery). hope i helped at all even though i cant give you a full proof answer,

ok, ph is right around 6.8 so i don't think that's the problem. should i remove the leaves that are becoming chlorotic at all? i figure once they turn yellow the green isn't coming back so i'm not sure if it's ok to cut them off or not.

Snakeman, I have had a few yellow and dying leaves, they will drop off when they are dead enough. I figure they keep working as solar panels while they are attached even if they are damaged.
The bad stuff comes from inside the plant not from the leaf itself.

Good luck!