The severity of the problem will depend on your total water volume, what kind of lighting you'll use (because it influences evaporation) but yes, this is a common problem and in Alberta the best solution is a HRV. Other options that will work but not as efficiently are installing a bathroom fan or other venting, or a dehumidifier. I found a dehumidifier to be noisy, inconvenient, costly to run and the dehumidification effect to be localized to whereever the unit was sitting whereas the rest of the house still suffered from excessive humidity.
A HRV ("heat recovery ventilator") trumps a bathroom fan in that it IS a bathroom fan basically but replaces the air being taken out of the house with fresh air from the outside, and uses heat exchangers to preheat the recovered air to something like 95% efficiency (rather important if it is -20 outside).
The whole house benefits too. Even if I quit my tanks I'll always have an HRV in my house, they are very useful overall.
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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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