Look up negative temperature differential. Warmer night temps than day temps, or at least not a huge swing in temps. That can help limit the stretch, also don't feed them with cold water.
Yay i new i should of flipped earlier but had some drying in there. How close can i put the light its 1000 watt hps with air cooled hood. My room temps are 75 and 77 at canapy level
Look up negative temperature differential. Warmer night temps than day temps, or at least not a huge swing in temps. That can help limit the stretch, also don't feed them with cold water.