Would a flood ever reach the height of your outlet? Or any exposed wiring where it would be immersed? If not, you may want to avoid the troubles AFCIs can cause with tripping.
Have you read this from Bean Animal's site?
Pros and Cons;
AFCI WHY NOT?
Arc Fault Circuit Interrupters are designed to detect the electrical signature caused by electricity arcing someplace in the circuit. If arcing is detected, the AFCI breaker trips and removes power from the circuit. At first glance the AFCI appears to be a perfect candidate for fish tanks. Where there is water and electricity, there is a significant chance of arcing type fires. The problem is that AFCI breakers have a well deserved bad reputation for nuisance tripping when posed with a complex load such as a motor or ballast. An AFCI would add significant safety to a fish tank setup, but would also expose the livestock to a much higher greater risk of nuisance induced power outages. Most AFCI breakers also incorporate a GFCI into the device. A single GFCI used to power your tank (as mentioned above) is not a good idea. If you do not use AFCI circuit breakers (or the newer AFCI receptacles) then please take the precautions to prevent arcing type fires. That means taking precautions to protect power strips and other devices that will be exposed to moisture, drips and salt creep.
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