You should only need one valve, in line from the regulator to the reactor. I suggest placing it as close to the reactor as possible. Yes both are good valves...
That is a long time to leave a tank... I hope you dont have any unpleasant suprises when you get home...
Jason
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120g, Flourite & Sand. DIY Stand and Canopy. CF lighting 3wpg, Pressurized C02, DIY reactor. 2-XP3's, 500watt heater.
Heavily planted
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