Wilting Plants - Any Ideas?

Can someone tell me what I'm doing wrong here? Week 3 into veg and they've started to wilt. Underwatering? Overwatering? Heat?
Temps go from 23 degrees C in day to 15 degree C at night.

This is my 2nd grow so I'm still new to this.
 

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What is your humidity at? How often are you watering? Did this just happen over night during week 3? What lights are you using. The more info the better.
 
Yeah, its hard to say without details, but looks like a watering issue to me. If your watering often, stop. If you hardly ever water, water more.
 
id say water it... if the soil is dry.. .give it water... has happened to me before... if the soil is wet then back off on the water... should be watering once every few days... looks like heat is too high and plants need it... that's what happened to me last time anyways
 
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