drying brown fan/water leaves

Liberty haze. Week 4 flower. Coco coir. 5 gallon bucket. American hydroponics nutes. Bottom water leaves have brown spots that are brittle and dry.PH 6.2 PPM 700

Please help
Thanks

Is it the entire plant or just that leaf? If it just a couple leafs pull those suckers off. Out of sight, out of mind.

Are you foliar feeding at all?

She's doing her thing. Fan leafs are the first to go. Smaller leaf will dry up and fall off here and there.
all the plant wants to do is flower, reproduce. Sorta like a Salmon, they spawn and then die.

OK. Thanks. Wanted to make sure it wasn't pests or disease.
I'm not familiar with foliage feeding