PNWaquarist
Aquarium Advice Addict
Whats the proper way to mount the heater, some say vertical, some say 45 degree angle middle of the tank, some say horizontal
Most people do it vertically or horizontally at the bottom of the tank. I don't think that there's a "wrong" way to mount the heater, provided that the water level is above the fill line and the heater isn't touching anything.