Have you tested your water? I don't recall seeing it posted. Your setup is not any different then mine. I know my tank is overstocked. I have 3 severums(5 inches) i blue opaline gourami(5inches),4 larger angles,3 clown loaches(5inches)2 albino dojos,1 pleco,1 green cory,1 bala shark and 1 ir shark. And I do weekly water changes of about 25%. The onlt thing that bounces is my nitrates and I know that's from my 3 year old son. He loves to feed the fish. Other then that all is perfect. I wouldn't take out the ug filter, change it if you want. But if your test are all ok then why try to fix something that isn't broken? I personaly like the airpump and the bubbles in the water. I get more then enuff water movement and no dead spots in my tank. Good luck with whatever you descide.