I assume you already have at least one 15 A circuit near your tank now to run things? For safety if not already done, you should be able to have a GFCI receptacle installed in place of the standard receptacle for starters. Then you can think about running a second circuit for redundancy, or even check some of the other receptacles that may be in the same room/area. If you're lucky & they are close enough and on another breaker, then you don't need to do much at all, except maybe install another GFCI. After that, as lastlight suggests, some good quality, heavy duty power bars or dj thingys. If you don't mind opening up the drywall a bit, you could even install a double box in place of a single box and have four receptacles where there were only two before. Could be a code issue though as sphelps suggests. Sometimes what you find when you start opening boxes is not pretty, particularly in older homes.
Some scary stuff I found in the basement hallway. Found some more in my bathroom for the light above the sink last week. Some days I wonder how my place hasn't burned down yet. I've got most of the electrical replaced except some of the circuits running through exterior walls.