How often should I do water changes?

[reefchaser]

75gallon
Fowlr
4 fish
Blenny
Chrome
Pink damsel
Yellow damsel

20 gallon sump with skimmer and filter sock. I also have a refugium with grass sand and 5 pounds of live rock.
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[mike007]

Some people do weekly, biweekly or once a month. I do once a month myself and everything is fine. Every tank is different it you need to moniter your parameters and do water changes as needed.

 

[redfishbluefish]

Since you have a Fish only tank (and a fairly light bio-load), you can run nitrates up fairly high. Your nitrates are also going to be reflected in the amount of food you feed. Accordingly, the only test kit I’d have is a nitrate kit. When my nitrates got to 40ppm, I’d do a water change. If I were to guess (and again, I have no idea what you are feeding), I’d guess once a month, if not longer.

 

[Downbeach]

Here's a few articles on the subject:

Water Chgs

WatChgAntArt

ScottsH2OChgArt

Water Changes in Reef Aquaria by Randy Holmes-Farley - Reefkeeping.com