How do you know when you need a water change?

[mfinn]

If I was a fish I would want a breath of "fresh air" pretty often. My fish are pleased and I think the corals enjoy a replenishment of trace elements.


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+1
My thoughts exactly.

 

[Xingu]

My answer to this would be, is it Saturday. Be proactive and regular with your water changes. Why wait for a problem to occur. You may find at some point that you need to do a larger change than usual because of a problem in the tank. You may also need to skip a regular change because you are away. We shoot for stability, but some guy named Murphy (there is a law named after him) likes to keep us on our toes.