Just wondering what %/frequency water changes you do, and why.
I currently have a really low tech 30g setup. One measly old flourescent, no CO2, no fertilizers. I never test my water, and the system seems to be extremely stable, with plants growing and propagating (albeit slowly) and fish appearing to thrive.
My past practice was to change 10% weekly. The tank appears extremely clean, and all inhabitants appear happy and healthy.
Reading this and other boards, I see that many if not most of you do much heavier and more frequent water changes. Why? What benefits does this confer?
Last weekend I did 20%, instead of my standard 10. My buddy was over that afternoon and asked about my changes. When I told him 20% a week, he and my wife said I was nuts. That 20% weekly was way too much.
Heck, I'm always looking for an excuse to avoid work whenever possible!