uaru

Hello everyone, I have a 125 gallon with two Uaru cichlids and many other fish. As of yesterday, my biggest one was breathing a bit heavy and had a lump on its head that I've never seen before. Today, it now has a white circle on the forehead and it looks like it has bruised its head from when I...

is there any peaceful smaller fish that could be kept with a pair of Uaru in a 90gallon aquarium?