I have a 135gal tank(72x18x24) in it are 6 gold severums(4") and 2 uaru a.(2.5") i have just added a 1" red oscar to the tank and am wondering if this will work. will it still remain peaceful? and will i, at some time be over stocked? the severums and uarus get along fine right now, but im wondering that at some point the oscar might start to bully the other fish. does anyone else have this combination? also i have 2 fluval 404's running on the tank now. will this be enough filtration?