I have a 55 with the standard 48" 40w bulb fixture on it. I am planning to lightly plant the tank, more for the fishes' benefit than anything, but it also makes the tank less empty looking. I plan to overdrive the bulb with a 2-bulb ballast, to give 1.7x the normal about of light, or 68 watts for about 1.25 wpg. What plants can I grow with this kind of lighting? right now I have java moss, an anubias and a cryptocoryne, not sure of the exact species but all low light plants form what I've read... The java moss is actually many years old... I've had it for a long time. There should be an aquatic plant newbies forum.:laugh: Anyway, thanks