When I first got my 2 there were in my 500 gal. They were located DIRECTLY under the output of a 2000gph pump. They loved it. I could find them crawling around and fanning constantly.
Since I have broken that tank down I have put them in a smaller tank but with high flow also.
These are one of those few types of creatures that really should be kept in a species only to fully enjoy them or larger tanks with high flow. That is one of the reasons why such a little shrimp needs a minimum of 30 gals. Not because it need the space, but because the flow rates would create a white water mess in smaller tanks.