OPEN REEF - ΤΟ ΕΙΔΙΚΟ ΦΟΡΟΥΜ ΓΙΑ ΕΝΥΔΡΕΙΑ ΥΦΑΛΩΝ

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http://www.reefs.org/library/article/t_ ... ll_wc.html

Conclusion

Weekly water changes will not maintain calcium levels in a reef aquarium. Some form of additional input, such as calcium hydroxide, is needed to maintain the calcium level. It can take months to correct nutrient levels with water changes alone. This isn't anecdotal evidence, this is clearly displayed in the previous calculations. I feel strongly that a properly run reef aquarium - utilizing protein skimming, calcium hydroxide dosing, dosing of potassium iodide and other essential trace elements, and a monthly cleaning requiring about a 10% water change - will thrive. Other than these simple requirements, there are numerous methods people can use.
It is better to maintain the levels discussed here, rather than have them swing up and down on a weekly basis. This is a common effect resulting from frequent water changes. In the preceding text I have questioned the actual need for frequent water changes, and I have attempted to dispel many of the myths about why people need to perform them, as well as myths about what they accomplish.