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Looking for a source of Calcium for my tank,  I got to thinking about tums.
They are mostly Calcium Carbonate and sugar.   Has anyone tried these.
The appear to disolve into water okay.   About 24 hours after putting them
in water with some movement they are gone.    Would this be in usable form
to the plants ?

The only time I need this is if I have been really busy at work or at home
and have not been able to do a water change in a couple of weeks.   If I
keep my water changes up I do not need this.

Just wondering what others thought of this source.