It is recommended (remember that these recommendations are just opinions of what will contribute to the general health of your tank inhabitants) that you circulate approx 10 times your tank capacity/hr. With that said, even if your filter is moving that much water, powerheads (Maxijets seem to work really well) will add a major boost in getting water circulated in the tank itself and facilitating gaseous exchange. Seeing that the powerheads are relatively inexpensive, it is a small matter to drop two or three Maxijet 1200 in the tank. I have a 135G with wet/dry and skimmer and I run additionally 3- 1200 attached to a RedSea wave maker. Right now tank is FOWLR
but I plan to add some corals when the tank has matured some more. On the issue of the wave maker, again it's nice to have but not necessary unless at some point you plan to have corals. It just adds variety to the water movement of the tank and I know my fish seem to enjoy it tremendously.
some of them even "swim the current"