Just a little info on the tank I am setting up first....It is a 55gal hex tank. The height of the tank is 29in. I am looking for a low-med light tank that does not require co2. For substrate I plan to use 100% clay kitty litter, azomite, osmocoat, mgocpm, (possibly some dolomite and latrite) with a cap of pool sand. So here is my question...because my tank is 29 inches high, would I need the Ray2 to penetrate that depth and give me low-med light? or will I still need co2 with that much light? There is only a $15 difference on amazon so I figured why not go for the Ray2 but not if I am going to need co2 and get overrun with algae.