Bottome leaves are wilting, please help!

I have 2 out of 10 plants that have this problem . I just checked the soil and the top inch of soil is dry but beyond that it is moist, so it definitely isn't under watering. I'm growing the plants in 5 gallon pots using foxfarm ocean forest. I have them under a 400 watt hps light and the temp is normally in the low 80s. What can I do to fix this????

ff is hot! some plants like much more N than others well into the flowering to keep them alive. I would add more N and see where youre at.

i just looked at your pics and they need water. ff is hot and the nutrients you are using could suck the water right out of the plant even if it is moist because of the salt build up...osmosis factor. I would give them a good flush and worry about the yellowing after the leaves perk up

Thanks for the advice guys! Any other opinions?

I was looking them and I think I may do a flush. I think you guys are right about the salt build

Hows the heat? only reson i see is because some of my last plants went like that' i thought it was water but it turned out to be too warm, just something to think about. scunk

You could have salt build up with a little root rot going on
It definitely some type of root problem, the downward canoeing
of the leaves are a sure sign of root troubles