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At 03:48 AM 10/22/98 -0400, Ken Potter wrote:" 
> I plan to build a large tank (300
>gal ?) for this room and would like to take advantage of the natural light.

At the risk of going high tech on you Ken, look into a heliostat.  It is
basically a mirror on a 1 rpd (revolution per day) motor.  Since it follow
the sun across the sky, and since it reflects the sun in a line due south
and parallel to the ground, the beam is always in the same place.  Now you
can move it where you want with more fixed mirrors.  You can get very high
quality mirrors in K-mart or wherever.   They are made from PPG float glass
and my last one cost $1 for 1x4'.  By investing $50 in a motor and drive
and $50 in a mount and $50 in mirrors you would have something better that
any commercial device and at a lower cost (and simpler).  

Dave Gomberg, San Francisco            mailto:gomberg at wcf_com