> A friend gave me an aquarium that had been sitting for several years. This
> had allowed all the water to evaporate and left the glass encrusted with
what
> ever was in the water. probably mainly calcium carbonate. It would appear
the
> water that evaporated was water that had been kept in the aquarium fro a
long
> time with no water changes so it was pretty concentrated before it was
allowed
> to evaporate. The glass has a very rough coating of something and I would
like
> to remove it without ruining the glass. What would be my best bet? the
coating
> is very thick and tough. Any help would be appreciated.
>
> Moon
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