You should have a GFI outlet installed at the least. A dedicated circuit couldn't hurt either.
Fist step, find out what all outlets are on that circuit. Make a list of all the items that will be plugged into that circuit. Add up the wattage of everything that is on that circuit. If it is something that is rarely on, don't count it. Next find out what size breaker it is. On a 20 amp breaker you can run 1920 watts continuously. A little more if some of it only runs now and then for a short time. 1440 watts if it is a 15 amp breaker. DO NOT put in a larger breaker. The breaker is sized to protect the wire in the house.
If everything you add to the tank plus all the other stuff on that circuit totals within those limits all you need to do is change the outlet to a GFI
If not, you may need to add a circuit just for the tank. I actually ran 2 dedicated 20 amp circuits to my tank.