Whatā??s up everyone

Iā??m new to growing, I never grew anything before, and im going to take a swing at it, I did my research on the forums and watched a few grow movies heres where im at so far

Flood and drain system
Rockwool cubes
4, 40 inch Cool and warm white fluros 6 inches from the plants
GH nutrients ½ strength
Ph 5.9
No ppm meter
seeds from some nice weed
Room covered in aluminum foil (Mylar is expensive)
Temp between 62-69 degrees

So im about 3 weeks in now, I was going with feeding twice a day and a 18/6 light cycle, with a fan on low
Well I was constantly dealing with droopy leaves so I cleaned my res and I changed my neuts
I checked my ph all the time, nothing worked

So I upped the light cycle to 24/0 and removed the fan, and threw a spray bottle into the mix(spraying with 6.0ph water every time I fed the plants) and they completely recovered , and not only that their thriving , thereā??s roots busting out of the bottom of the 3 inch rockwool cubes everywhere

So I was wondering what happened here? Whatā??s the advantages of an 18/6 light cycle compared to a 24/0 cycle in the early stages of an immature plant, and are there disadvantages of not having any dark time for the plants?

I was just wondering, if anyone wants to jump in here and explain this to me Iā??d appreciate it and if not thatā??s cool too, and if anyone has any tips or advice for a flood and drain set up that would be cool too, cause you donā??t see too many people doing those, everyone is into the DWC bubblers and aeroponics, and im a newbie so whatever

Thanks
PatM Reviewed by PatM on . 18/6 Vrs. 24/0 Whatā??s up everyone Iā??m new to growing, I never grew anything before, and im going to take a swing at it, I did my research on the forums and watched a few grow movies heres where im at so far Flood and drain system Rockwool cubes 4, 40 inch Cool and warm white fluros 6 inches from the plants GH nutrients ½ strength Ph 5.9 No ppm meter Rating: 5