I have a 150g humidifier smack dab in the middle of my house with various electronics around it. So far so good. When your fish tank evaporates it evaporates water, not salt, so the air in your house shouldn't be salty.
If humidity gets really bad you should invest in an HRV. Good for other things too, not just to dehumidify the house. I'll be investing in one myself in a couple of weeks here.
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