My current setup is a 150 5x2x2 over stocked with bichirs, clown loaches, bass and dat. My current filter setup is two Eheim Pro 2 2028 canisters with an Emperor 400 HOB. There is also a couple powerheads in the tank as well. I was thinking of adding an fx5 to maximize filtration. Is there still room for improvement on my filtration setup or have I already reach the threshold?