All good points, biggest thing is that small wire size = heat buildup. Some poeple put in 20A breakers on 15A circuits without problems, mainly because they have a hair dryer kicking the circuit out or something. It's still bad.. but not a huge fire hazard. The deal with the fish tank is that you'll be puling a big draw for hours at a time, allowing the wires to heat up, creating more voltage drop, causeing more heat... until it gets bad. I'm pulling a second circuit for my tank this weekend for the same reason, i'm not tripping the breaker, but i'm running VERY close(i've tripped it with a 250W heater added). I just want extra room for security.
As for GFCI breakers, the wall plugs are defintily cheaper, but check out craigslist for GFCI breakers. Sadly they're probably stolen from worksites, but they're often on there.
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