DWC marijuana grow questions

A question from a fellow grower:

Looking for some advice. Two indoor control environment grows with you seeds. Control PH, temp, CO2, humidity, etc. Any clue to why the difference in growth speed and I keep getting the bottom leaves starting to yellow around the edges and then they die off. Watering 4 times a day for 15 min and lights on 18 and 6. Any suggestions would be greatly appreciated.

Please fill this out for me. I can give you a more informed answer with this info. We all grow in DWC as well as other Hydro systems; So I am sure we can get you straight. Peace :slight_smile:

Seedbank used:
Indoor or Outdoor?
Size of space:
Soil or Hydro?
Medium used:
EC/TDS ppm levels:
Humidity %:
Light system/watts?