I don't have any supplemental lighting and I don't like looking at a dark tank so the lights are on for 10hrs. I have good colour and great growth.
1. 29" deep tank
2. 250w 10k xm's with hqi ballasts approx 12" off surface
3. lumenmax elite reflectors
4.sps
5. carbon changed ever 6 weeks or so
If cutting back on the lighting period means increased growth maybe I'll keep the lights on for 15hrs instead
