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Generally folks with decent GH's have enough Mg and Ca(eg from Tap or reconsitiuted RO).

Sometimes there might be not enough Mg, but seldom Ca.

It's rare but possible and easily addressed with CaCl2 and MgSO4.
But few folks meausre Mg/Ca individually.
I just suggest adding GH(both of these) or SeaChem Eq.

That takes care of things simply.
But you can try to induce Mg or Ca deficiency to see the effects if you want.

Regards,
Tom Barr
 
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