Welcome,
IMO, You should have strong water movement at all levels of the aquarium which in turn would create lots of "swirls/waves" on the water surface.
This is critical to gas xchange. No film at any part should be present on the waters surface. Look up through the tank at the surface.
In the rock area you will have lower flow which is fine and often a good thing for the inhabs.
Several powerheads pulsed or a nice strong one on a pulse would work.
I bet most have at least a 2 degree temp swing.
Flow on and enjoy, the best is yet to come
Chip