lovely, what kind of equipment do you run??
But thats what funny about it, I have gone many months (due to the weather) without a water change and have only then had to resort to supplementing calcium (kalkwasser), I only do the water changes now simply because its there and its free. One of these days I am going to get up the nerve to just not do any water changes and see how long I can go, now that I got my phosphate issue dealt with (bad test kits fooling me into thinking my tap water was okay for use). I'll probably lose my cool long before my tank does though...lol