GA> I havent done a water change in over 2 years.  I replace the evaporated
 GA> water with aged tap water (about 2 gallons every two weeks).
 GA> I fully test my water monthly and everything checks out O.K.
 GA> I'm assuming because I maintain a small number of fish (2 damsels, 1
 GA> tang) that the aquarium is it's own ecosystem.
 GA> Am I wrong here?
 Not totally ;)
 I have the same situation with my salt setup.  However, down here in
 Florida, so much water evaporates from the tank on a regular basis
 that I'm usually adding more than a few gallons every few weeks
 anyway.
 John Dailey
 Author DM/GW
... Press F1 to Reboot
--- Via Silver Xpress V4.3 RB10306
---------------