This article is from the ReefKeepers FAQ, by several authors (see the Credits section).
"The solution to pollution is dilution". Water changes are used to
correct problems. Minimal changes of 5%/year when all is set up
and running smoothly may suffice. Some feel that an occasional
water change of about 20% every 1-3 month is a reasonable safety
net that may help prevent contaminate buildup and trace element
* depletion problems. Others recommend 5%-10% per week.
 
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