[APD] calcium carbonate/sodium bicarbonate and invertebrates

[SunflwrgrlS at aol_com]

I want to go over this again. When it comes to buffering water, sodium 
bicarbonate is suggested.  However, I want to know if this is something that 
invertebrates are able to utilize or not?  I add Calcium Cloride but recently read on 
an invertebrate site that they need calcium carbonate for moulting.  Should I 
get another product to provide the calcium carbonate?  

And, does anyone know what is in Kalkwasser?  

Thanks!
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