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Matt,
Some quick research I did in the past I tend to agree about volume. compared to our tanks. I still feel with proper maintenance and controlled feeding we don't as many WC as we do. I am a bad example of course but people here and else where have had success.
I rarely do water changes as well but my tank does have issues. Probably all my fault; over feed, improper flow, etc. I do add CALC, ALK and Magnesium.
If you think about this where does the ocean get new water full of trace elements from? Is it rain, something we never considered? We all know...