A good flushing never hurts anything but I doubt thats the cause. A couple lower leaves looked deficient, not burned. Most of that probably came from light and bug spray. @grower from cali did you spray those plants in the day time or night time? Also dont worry about it going hermie from pinching the dead leaves, and flush if you like it never hurts. We use flora kleen or clearex, both are awesome.wow people say the dummest thing try flushing them for a couple days maye nute burn / over fert