I have used salinity and IO and from the two I feel IO is better from a mixing point of view. It took salinity for ever to mix in comparison at least from my experience.
I have 1 mm fine sand in my tank, I had to strategically place some rock islands to keep it from blowing around when my power heads cycle up, something to keep in mind. I knew that could be an issue, but I wanted the 'white' sand bed look in my tank so I just did some intervention before it became an issue.
I have about 1 inch of sand, so definitely not a DSB, I have heard and read many posts and articles some for DSB and some against. I think if you keep a goby or other sand sifters in your tank like I do, you should not have any issues with whatever you decide to go with.
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130 Gal Community Planted Tank and a 250Gal Peninsula FOWLR
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