ive only got diy co2, and the light is too much and algae is terrible. but thought if i took away a whole 24w the lighting might not be sufficient to grow my carpet plants.. ill put in a few pieces of frogbit, i just thought that they dont diffuse light more like block it completely. but finally yeah i took out a bulb and will experiment. i tried carpets before and thought it was the lights you see but now maybe it was ferts. I've got root medic root tabs now after the rave reviews so fingers crossed.