Hi everyone. I just installed a new fluval 305. I have wild fish, bullhead cat, green tipped sunfish, rather large fish. Eat mostly live with parts floating around. It dose mean cleaning the filter more often. The employees end up doing in my quick disconnects on the renas. On the fluval it says to have the out take under water. Wild fish go to the top as soon as the oxygen drops in the tank. With the outtake under water the oxygen created by the spray bar on the old filter has decreased. Can I pull the outtake up to get more agitation? I have a large air stone on the opposite side of the tank already. Can you add a spray bar to this unit?