Water Changes When Nitrates consistently read zero?

[kien]

ahh, water change discussions, gotta love 'em :-) Not too long ago I was on a two water changes a week schedule. That didn't last long. Although things always had that "breath of fresh air/water" look. I'm now back to my weekly water changes but I do quite a bit every week, like 17%. Sounds like I can drop that down to 6% a week!?