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Re: Glass cover

> Date: Tue, 16 Jun 1998 23:45:04 -0500
> From: "Guillermo Vega-Toro" <gvega at gte_net>
> A question for those of you who have built your own glass covers for your
> tanks. What type of glass do you use? Is the type sold by Home Depot OK? I
> did a search of the archives on "glass covers" and found a post mentioning
> Pyrex and Starlite as the best choices based on tests done by some other
> member, but I did not find any more references. I have a 115 gal tank with
> four 110 watt Aquasun bulbs (and two 3 inch computer cooling fans) , and
> evaporation is quite high - I have to add 1 gal of R/O water every day. I
> want to build a glass cover to cut on evaporation, but I want to make sure
> that the glass absorbs the least amount of light.

IMHO, the difference in light transmission between ordinary window glass
and special higher transmission glasses is nowhere near as significant as
the difference between (your choice of glass) when clean and when dusty,
with watermarks from dried minerals, algae, etc.  Clean your cover glass 
frequently with clean water, and use vinegar if necessary.  For a tank
the size of yours, think about how to make the cover in pieces that are 
easily removed and carried to the sink.