have you painted the back of your tank? or is it just the wall behind, went to the store today and ordered 2 of the longer bulb's, i think they are 25w 8000k superlights, i got the smaller bulb the other day, 20w 10000k superlight, i also have started to use 5ml flourish after each water change and 1/2 sera co2 tablet each day, will get fert balls and buy sum plants and see how i go once the new bulbs arrive.