Save yourself the future grief and start doing water changes. I've tried going a long time without water changes in the past and the end result wasn't nice at all. You end up with a buildup of things that don't belong and are depleted of things that should be in your water.
Plus the chance of getting an ionic imbalance which is a pain in the butt, because then you have a fun time trying to get your alk, pH and calcium to stabilize. The long and short of it is that in my opinion, you will be left with a tank full of water that barely resembles ocean water.
The price of salt is inexpensive and it just takes a bit of effort to do a water change, but in the long run the tank will be better for it. Once your tank takes a dive because of water change neglect it can take quite a while to reverse things and get the tank looking like it used to. Some may disagree, but that has been my experience.
Bill
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