All of my information is on my profile. I was concerned about light cycles, not the amount of light. I.E. 12 hours light, 12 hours dark, 24 hours light, etc. I know that certain plants behave differently with different cycles of light. I try not to do supplimental co2, as I have had bad luck with ph swings in the past. I had a beautiful discus tank once, added co2, and the ph swung so hard over the next few days, my tank was wiped out. And, I can't justify adding a professional grade co2 injection system. Never heard of the liquid co2. I'll look into it, though.