Water changes?

[ABATTLEDONKEY]

hello,
I am just wondering what all your thoughts are on when, and how much water should be done in a water change. i approx 30% a month but i buy water from the store. thats $30 a month alone in water costs. im thinking about mixing my own but i wanna pass it by the RC first so i dont mess it up. any help is appreciated. thanks
-Paul

[bertoni]

I do 20% once a month, but there are lots of schedules people use. Yours seems fine to me. I might do 2 15% changes, instead, though.

[demonsp]

Really depends on water readings ,and amount of stock.

[Reef of Eden]

on my 55 gal i do a 10-15 gal water change weekly.

[nanoguy]

I do 20% every two weeks on my 55 gallon I'd suggest you pick up an RO/DI unit and just mix it yourself.