Death by water bro.
Don't listen to anybody's advice on schedule or frequency. Every grow room and plant's need is different. Lighting, fans, intake temps, canopy temps, soil medium, age of plant, and many other things factor in to water consumption.
When I was learning how to water this is how I did it.
Grab a pot about the same size and fill it with soil. Now lift it up, that's your dry weight. Try to remember how it feels when you lift it up.
Now pour some water into it slowly until you see water coming out the bottom. Lift up the pot. That's your wet weight.
Only water your plants when you lift them and they feel like your dry weight or your see the leaves drooping down. After about two or three weeks of watering this way you will get a feel for when it's time to water.
If in doubt, don't water. It's about time to start feeding them, but I would wait until the soil drys out a bit. Maybe in a couple days after you fix this issue and the plants respond positively.
Good luck.