Well, I honestly can't speak to a smaller tank like that. It may work the same, but I'm not sure. The reason i was asking about flow is because shortly after I got my goby I added two Koralia 750's to my tank, and that huge boost in water flow really seemed to help keep the sandstorms to a minimum. My sand is pretty fine as well, though it has been in the tank for (4) years and in another for (6) so its about 10 years old. I'm not sure that would really make a difference, but it might.
Its hard for me to say, because our systems are so much different. I have no mechanical filter at all, I only have an overflow going to a sump filled with more liverock.
I will say that it took a few days of getting stirred up before the sand super fine dust particles started to settle. Then they settled all over my LR
and that was a pain, but now I just use a turkey baster every couple days to blow off the rocks, and now big problem. Like I said too, the PH's really helped getting the sand blowing around and through my sump.