if you keep mostly softies then you wont have a high Ca demand because they dont have the internal sturcture that SPS and most LPS have and they need Ca to continue to build on this and grow.
but if you had a 200gal SPS reef, then SPS are known to be a big drain on Ca levels so im sure you would need large amounts of kalkwasser or other means of adding Ca to the system.
hope this helps, james



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