I had a little conversation with Boomer and a few others on here, read a few articles, and did a little testing on my tank. Basically, when I was setting up the tank, I was running 2 ozone generators and couldn't keep the ORP above 250. when I did a water change using NSW, the ORP jumped to over 500. I did some research and decided to unplug them and see what happens. After the tank finished it's mini cycle and stablized, the ORP is constantly above 350 so I don't need it.
If it drops to around 300, I'll do a 100 g water change. Until then, it's just 50 G about once a week or so. From what I gathered, the very basic is that the lower the ORP reading, the dirtier the water is. By using Ozone, you are sort of putting a band aid on the problem. I'm more of a minimulist when it comes to equipment. The less extra "stuff" I have to run, the better.
If youd like, I can try and find some of the post that explain ORP and what it means. One article I got came from a book by Theil that I got from Margaritti Man when I bought the tank.