My tank runs on a dedicated breaker I installed before I setup the tank. I wanted to isolate the tank from the rest of the building in case something besides the electronics on the tank caused a breaker to trip. I would hate that a cash register or vacuum cleaner would cause my tank to go "lights out".
I also elected to install a GFI breaker at the panel. That way, no matter what I plug into the outlet I have the tank on, it is all protected by the GFI.
Oh, and it's a 20 amp breaker BTW