Incidentally in answer your second question I have one GFCI circuit per tank (theoretically -- there is a little bit of mixing and matching going on, due to convenience of promximity of plugs and stuff like that). It depends on how much stuff you have, but my two tanks are 75g each and one of them in particular has something like 20 devices pulled off it. Within the 10a limits though.
If you WANT to protect your tank with more than one GFCI, go for it, there's no reason not to. If we're talking about a 200g, 300g tank though, you will likely find you have to have multiple 10a circuits running the full gamet anyways.. So it depends on how much stuff you have I guess.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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