the best setup for this I've seen was on this site, somewhere. powerheads on one side of the tank with pvc running under the substrate to sponged intakes on the opposite side. anybody know that thread?
I think that pump would be ok, as long as they have something to get behind for some peaceful flow time.
I'd try it in different directions. running along the front, then along the back, to see where the fish tend to congregate. it would be cool to have the flow down the front of the tank to see them playing in the flow right up front, but I wouldn't expect them to be in that spot the majority of the time.