What is kH and your calcium? Post those levels before you do anything. What brand of salt do you use? What are your other levels: Ammonia, nitrite, nitrates?
What is your alk and calcium level? I can't help you if you do not want to help yourself. Instead of just saying everything is fine, post the levels. Obviously everything is not fine if you have that low of a pH.
There are a few different ways to raise it depending on what your alk + calc is. If those levels are fine then you probably just need to let some fresh air into your tank.