By code a 15 amp circuit is allowed a total of 1200 watts. So traditionally each 15 amp circuit has 12 outlets of lights & plugs rated for 100 watts at each outlet. Most of us that have aquariums use a power bar to operate the various things such as heaters, skimmers, lighting etc. When you plug a power bar into a wall outlet, remember to choose a wall plug in that's not on a circuit that's heavily loaded. So do the math and figure out your total wattage for your aquarium and what's on the other plugs in that circuit to try and keep it at 1200 watts maximum. For the sake of safety try and use at least 2 different circuits especially if your have high wattages such as MH lights & heaters. I also agree that your power bar should be mounted in the driest area possible to avoid salt creep causing you grief.
