Help with better canopy [actives]

Albino golden teachers. I did unmodified mono tub this time . Still don’t understand how to get big canopy’s . Is it genetic or something I’m not doing right ? And what’s the best way to do a 2nd flush

Albino golden teachers. I did unmodified mono tub this time . Still don’t understand how to get big canopy’s . Is it genetic or something I’m not doing right ? And what’s the best way to do a 2nd flush