Roseline shark amount of current?

[MultipleTankSyndrome]

I notice the young roseline sharks I picked up not too long ago tend to spend all of their time out of the main flow from my Sicce pumps. No swimming against the current at all, so it seems the pumps are currently only there for oxygenation purposes. This is in spite of everything I have read about them saying they love lots of flow.

Could this be be because they are young, and won't fit the description of the current loving fish I have read about until older? I have heard some other species of fast water fish (such as the payara) move into faster water as they get older, which seems like it might be the case with roselines?