I am upgrading to a 135 gallon tank (60"x18"x24"). I have 2 synodontis catfish (~30 years old, 10"), 1 striped raphael catfish (~25 years old, 8") and 1 clown pleco (~10 years old,4"). All have lived together in a 120 gallon tank.
I would like to add more fish to the tank but I am concerned...