How often do you do water changes?

personally I do a 20% weekly
 
yeah 20% about once a week, sometimes I leave it a bit longer.
 
50% twice a week, cleaner water means healthier fish.
 
twice monthly. Even then the water I take out is not detectably any differnet to the water I put in (pH KH GH NO3 NO2 NH3 etc).

But then I'm way below my stocking limit with a huge filter.
 
I change about 20% 2 times a week :) I usually clean the sponges on my filters at the same time in the dirty water. You'd be surprised at how dirty they get!!

When I was first begining and having a lot of problems I was only cleaning my filters about once a month. Once I started cleaning them more often I started having less and less problems. The dirtiest sponge is in the 26 gallon which houses my bristlenose pleco. Man when I squeeze out the sponge the water goes BROWN!! It's gross :sick:
 
15% twice a week. A 5 gallon (19l) plastic carboy is easy to manage and in my 125 litre tank that works out to 15%. I'm considering doing larger changes though, 30% twice a week.
 

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