Is this nute burn?

Plants looked very good this morning and now they seem to look sickly and they have some discoloration on the leaves.
Can anybody offer some advice?
I'm using MG growing under cfls

I'm thinking maybe nute burn from a little too much water or something along those lines but thats really just a guess.

Any advice is greatly appreciated

could be, though it's more a problem of younger plants, you're pretty well along in flowering
did you hit with a lot deeper watering than other waterings?
the last pic doesn't seem to show burn, more deficiency or nute lock
have you ph'd your outflow water?

I havent actually ph'd at all. This is my first grow and i'm still learning a bit. I had been watering every few days but they seemed to be drying out a little too much so i switched up to giving a smaller dose of water daily. they did pretty well when i initially switched my watering but then started to look sick

growone said:

could be, though it's more a problem of younger plants, you're pretty well along in flowering
did you hit with a lot deeper watering than other waterings?
the last pic doesn't seem to show burn, more deficiency or nute lock
have you ph'd your outflow water?

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from your watering routine, sounds like salt buildup has occurred
as plants feed, waste salts build up in the soil, especially with chemical ferts such as MG soil
water needs to run out the pot in sufficient quantity, about 20% of the total water used
if you allow things to go as is, plant will probably continue to deteriorate