It depends on how old the bows are. Go with moderate and have lots of spots for them to get out of the flow.
Young bows like current. Once they start spawning they don't care. They are too busy spawning. In fact, if bows were livebearers they'd put platys, mollies, and guppies to shame
Roan
PS
I appreciate you not PMing me. The information belongs out here for other people to use, not in my in and outbox. And there's always the person who does not ask just one or two questions, but wants me to walk them through an entire new tank setup, including cycling and fish stocking. I just don't have time to do that, especially when there are so many other people on here that can give the same information that I can.