My new kubotai and striata are settling in nicely- they're eating everything I offer them, and they're out and active all day

I'm planning the setup in the big tank for them, and I'd appreciate some advice.
Since the tank is quite tall and narrow (12"x32"x21") I'm thinking it would be difficult to set up a good end to end flow, so I'm probably going to make the flow circular, with a manifold at the bottom sending water one way, and a spray bar returning water in the other direction at the top of the tank.
I'll probably go for an Eheim classic external filter, either the 2213 or 2215, but I'm not sure what size powerheads I should use for the manifold. Do striata and kubotai like the same kind of flow levels as clowns?
The tank's moving up to my bedroom, so can anyone recommend a quiet powerhead or air pump? I need my beauty sleep
