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yikes.. that is staggeringly inadequate light for most any macroalgae my friend. I cannot imagine that you are getting vigorous growth (and substantial nutrient export in kind) with that glimmer of light.
Most popular green marine algae species (and true vascular plants) require reef lighting intensities or better since they come from the same or shallower waters as our corals.
A decent rule is at least 5 watts per gallon for such macros. A cheap DIY MH pendant (50 or 75 watt) with an excellent reflector would get you by here.
Anth-
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"If you give a man a fish, he eats for a day... but if you teach a man to fish, he eats for a lifetime."
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