Once a month was fine for me. More frequent changes might be necessary if the tank has a lot of corals releasing allelopathic chemicals, or some other issue.
I have a small media bag and a large media bag of carbon in my sump. The small one I change every week to two weeks and the large one I change every three weeks to four weeks.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.