Looks like a classic case of too much grower input...
24 hours is fine and should work flawless if you keep up good rh and waterings.
If your giving tap water, don't add cal mag.
If your fan is blowing directly at the plants, divert it so the wind won't hit them.
A good rule is to look at the ingredients of your soil mix and understanding what it has or not.
In your case, it has everything in it to support plants without you adding anything, not at this stage anyway, anything you add will create a toxic rootzone if added improperly.
This is primarily the reason people have problems with fox farms or any enriched soil mixes, it's the KTM Ready to race soil, you plug and play it, not add or take from it.
Set your PH to 6.3-6.4 and check with EC meter where your tap waters level at.
To me your plants are overfed and in a toxic rootzone, I know some said here you need to feed them but please don't as just adding N to this soil mix (not counting all other elements) will surely kill them.
Check your water ec and if it's a normal value just give them water for now till run off until you see the plant stabilized.
As always, more info would help so if you can layout your process of waterings (ec, ph, nutes used) and environment (rh, temps, lights used,) we can help more.