Since I don't know much about fish, I can't usually offer advice. However, I am a licensed electrician, and this is what I do for a living, so I can help here.
First, anytime you have electricity and water in close proximity, you MUST use a GFCI (Ground Fault Circuit Interupter) outlet. Not doing so puts your life at risk every time you mess with your tank. If you happened to knock your light or pump into the tank you could suffer a fatal electrical shock. The breaker protecting the circuit would be of no help because breakers are not designed to protect people, but rather to protect property.
Here is the difference: Breakers protect the wiring in your home from current overload conditions by energizing an eletro-magnet when the power is on. If a short circuit occures, current in the circuit skyrockets. The higher current through the magnet makes it strong enough to pull the switch inside the breaker open. This system works very well, but it is not fast enough to always prevent an electrical shock.
On the other hand, GFCI outlets measure the current flow between the hot and neutral legs of the outlet. The current should always be the same. If an imballance is detected (ie, more current on the hot leg than the neutral leg) something must be wrong and the GFCI opens the circuit. It is a very fast response, usually within just a few milliseconds.
The point is, NEVER trust a breaker or fuse to do the job of a GFCI.
Being that you are only 14, ask your parents to install a GFCI where the tanks will be, or have one installed by a qualified electrician.
As for the original question, two surge suppressing plug strips can be plugged into the GFCI for a total of 12 outlets, as someone else mentioned. The outlet should be rated for 20A depending on when the home was built, so I doubt you will have an overload condition unless you also have a window air conditioner on the same circuit. Again, not knowing how the home is wired, I can't gaurantee that.