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Calcium deficiency

Hi group
an observation from my tank is that my mystery snails have a degeneration of
there shells and by my reckoning it must be Calcium lacking in the water.
I may be wrong but any clues would help.
Also if it is calcium how can I safely add some so as not to hurt my fish?
My water is
pH 7.2
KH 4
Gh 7

From the" Land Down Under"
icq 13931687