On Fri, 23 Oct 2009 19:37:12 +0000 (UTC), Richard Sexton wrote:

I currently have a 36" Coralife fixture with one T5 10,000K, 21 watt
lamp and one Actinic Bluelight, 21 watt lamp.

snip

Lose the actinic, it does no good in freshwater whatsoever. Replace it
with a regular bulb and you've made the first real improvement.

Not strictly true to be honest. Photosynthesis does use the blue end of
the spectrum as well as the yellow and red end. It's green that isn't
really needed, after all most plants reflect it :-)

There is a nice primer on photosynthesis he
http://www.emc.maricopa.edu/faculty/...BioBookPS.html

and a couple of graphs show the absorbtion, about a third of the way
down.

The OP has really got marine lighting and would be best to dump both of
them for freshwater and plants.

--
Regards - Rodney Pont
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