I will be adding c02 today to my beginner 10 gallon planted tank. Right now I have two 13 watt CFL's. There has been a little algae growth, which is to be expected. How many hours a day should I keep the lights on? Should I increase the amount when adding c02, or get brighter bulbs, such as 26 watts? Thanks.
Hi Jerad Wilson,
Funny, Tom Barr was asked that same question last night at the GSAS meeting here in Seattle. What Tom said it was not necessary to increase light intensity or duration if we add CO2 it's just that the plants will grow faster (and use more nutrients) with CO2. With CO2 the light intensity/duration could
be increased but that would increase the use of nutrients even further.
I would suggest first just adding the CO2 and not changing your photoperiod or intensity. Wait a couple of weeks and watch for deficiencies in your new growth. Then once you have everything in balance increase your photoperiod a little bit (maybe 1/2 hour) every couple of weeks watching for algae growth and deficiencies in new growth and adding additional nutrients if deficiencies arise.