I don't want to run just one bulb though. There is no option other than CO2? I want to have the Anubias but I also want Aponogeton, Ammannia, Lagarosiphon, Nymphaea and Nesaea. If I have to go with CO2, I will but is it okay that I will only be there to monitor the system 8 hours a day? What about CO2's affects on fish? I am sticking with African river fish and plants.