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Do softies and anemones consume calcium or alkalinity? I know they dont make calcium carbonate skeletons like stony corals, but do they still use it? Do tanks full of nems have noticable consumption?

Magnesium isn't a trace element, and it won't be appreciably consumed by anything that doesn't calcify. Either is iodine a trace element, but many organism will take it up. Certainly, many true trace elements (iron, copper, manganese, etc.) are taken up by every photosynthetic organism, either from the water or in foods.

