[Steve Pituch]

I have never had my KH and GH vary. Most of my tanks are open top. I do a 50 to 80 % water change weekly. I never top off the tanks. I lose about 1 inch of water due to evaporation weekly.
http://users.ev1.net/~spituch/Steve's Page/Aquarium/125gal_biotope/125gal_biotope.html
http://users.ev1.net/~spituch/Steve's Page/Aquarium/hardware/fish room/sunroom.html

Regards,
Steve Pituch