11-19-2011, 04:21 PM
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The wpg "guide" is next to useless when it comes to small tanks or very large tanks, and with the different types of light even more-so. For instance, I have 72 "watts" over my 5-foot 115g tank, and 20w over my 10g. But the former is T8 fluorescent tube, the latter is compact fluorescent incandescent. The same plant species grow identically in either tank. This is like comparing apples to oranges, i.e., = unreliable.
What sort of bulb is it--normal incandescent, compact fluorescent screw-in, ...? If the plants are growing well, and algae is not increasing, there would seem to be a balance. I certainly wouldn't mess with CO2 in that small of a tank.