IWAKI GONE BAD ?

[Tank Predator]

LATELY I HAVE NOTICED MY TEMP GO UP BIR TIME IN MY 180 SO I UNPLUGED MY HETARE AND ITS BEEN 2 WEEKS AN THE TANK IS AROUND 90 IM STARTING TO THINK MY PUMP IS GONE BAD CAUSE ITS RUNNIN HOT CAUSE IT TO WARM THE TANK ?

ANY INPUT WOULD BE GREAT