ok i think you all agree that my wattage is enough,I was wondering about how many hours the lights should be on for optimum plant growth,nothing more..for the moment is 7 hours per day,I will slowly increase it to 10 as you have suggested IF i got that right..im running pressurised co2.im keeping no fish or inverts in there cause i want to keep co2 high without the risking fish health,at least for the moment..im dosing 24ppm N03,24ppm K,3ppm P04 weekly and 9ml of flourish..on and off days etc..with 60-70% weekly water changes,how about this?regarding drop checkers I need some more studying,is there a different solution for specific KH values?can someone give me a link on how to prepare and use drop checkers as well as general information on them?thanks a lot..