I think you need to slow down and do some reading about maintaining saltwater tanks. I get the feel you're rushing all this, and that's not a good way to start.
Saltwater from the ocean isn't going to do one bit of good to resolve your nitrite and pH issue. Your tank is cycling. When it's cycling, you WANT nitrites so the beneficial bacteria can build up. Nitrites are a necessary part of cycling. And while you're cycling, your pH will go all over the place because of the amount of biological activity going on in your tank. Once the cycle is over, your pH will stabilize. THEN, after several 30% water changes or so to bring the nitrates down, your pH should be stable and where you want it.
I understand that you made some mistakes in setting up this tank, but there's no reason you need to rush to fix them. Think you're getting some good advice in this thread.
By the way... ocean water, in my opinion, isn't necessarily better than anything else. It *could* be better than tap water because it doesn't have all the chemicals in it to make it potable, but then again... it *could* be worse depending on where you're getting it from. You mention that it's filtered, but I doubt it's much more than a sand filter to take out the big nasties. Unless it is UV
sterilized and run through skimmers, you could be getting all sorts of interesting stuff in it. You could still be getting nitrates and phosphates, and who know what else. In addition, your calcium and pH levels might not really be where you want them. Seems like ocean water from near the coast is lower than what's normally recommended for reef tanks. As Fluff mentions, before switching to it, I'd get some samples and test the heck out of it.