number 14 wire will be sufficient, as for the 2 GFCI breakers, I would just go with the plugs because the breakers cost more and the plugs will do the exact same thing and will isolate the power loss to just your tank instead of the whole basement. Not to mention if you come home and see that one of the GFCI's have tripped you don't have to go runnin to your electrical panel to reset them.
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500G Mixed Reef

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Electrician, Electronics Technician, I can help with any electrical questions you might have!!
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Kevin
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