I am slowly starting to get my new 55 gallon ready to be a planted aquarium with some Cichlids... It has two 18" T8 bulbs 15watts. One of the bulbs is blown out so I figure might as well buy two new ones because I have no idea what kind of bulb came with it. I have decided to do pool filter sand for the substrate. I am also doing the DIY 3D rock background from that foam stuff. As far as DIY CO2 would 2 2L bottles be enough for the 55 or should I do 3? What should I look for as far as bulbs go? Some people seem to say 6500k is fine other say it will promote algae, so what should I get?