100mg for a 360g tank might not be enough. and sometimes it takes longer depending on the water quality. but as long as you are adding it, it should be okay. from my experience. I am using 100mg for my150g tank. It does go up faster once I change my water. from what I read and on my tank. the ozone should be used up in the skimmer itself. I don't run carbon anyway. And trust me. I see a huge difference in the color of my water. it is much more blue.
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