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Re: Glass cover

If you are concerned about the light penetration you should use acrylic
which has about 7% greater transmittance than glass.  Acrylic is also easy
to cut with a table saw, thus you could custom fit it to your tank.
However the acrylic will eventually warp with time, but if you flip it
over it will warp back.  If you go with acrylic you should get it from a
plastics shop as they are cheaper than most do it yourself hardware

I agree that keeping it clean is most important though.

PS Acrylic has greater insulating value than glass, so that may help keep
the tank cooler also.  Last thought is if you put a top on then you will
have much less evaporative cooling occuring, which will make the tank
warmer, which may be a problem in summer.
o    Mike Nielsen                                                        u 
m    Department of Geography         THE OPTIMIST BELIEVES WE LIVE IN    ? 
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e    mnielsen at u_arizona.edu