Water change frequency question

[srossnz]

I believe I have heard that you do 20% every 2 weeks. I read somewhere not too long ago (can't remember where) that if you add a refugium, skimmer, etc that this can go to once a month in a FOWLR tanks. Can anyone shed some light on this for me? Thanks!

[TropicalNorth]

IMO water change size and frequency on marine tanks can be highly variable, depending on size of the tank, filtration, water parameters, stocking etc. I do 10% weekly changes on a 20g with a skimmer, because its a small tank its not too much hassle. Like you said water changes can be decreased with better filtration (skimmer, refugium etc). I think on larger tanks a normal water change is around 5% a week or 20% once a month.

[RPetty]

i do a 30% once a month. I have a skimmer and a wet/dry. Works great for my system.

[Grins]

I do about 10% weekly. I could probably go longer but I've been sticking with what I started with.

[clown-lover]

It really depends what is happening to my tanks.. If I see something strange going on I have a tendency to do a larger water change but my normal change is about 10 to 15 gallons.