I can't confirm or deny on those fish and low currents. I currently dont have any angels.
I only have a yellow tang, blue tang, watchman goby, blenny and 2 clowns. I do know the clowns surf my return nozzle, like catching a wave at the beach. LOL They will do it all day long. I also have a timoni tang in qt now to add this weekend.
But the tangs seem to like the flow, they are always out front to where my powerheads are focused.
The fish I;m planning on adding I don't think will mind the flow either so I should be set in my setup.
You also need enough flow to get every nook and cranny of your tank moving, you want no dead spots anywhere.
A trick I picked up here and was using was adding a bit of purple up on each side in front of the powerhead. It is milky in color so it actually will disperse and you can see where the waterflow is going.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.