Wow! Very impressive build so far, looks like you're on the Fast Track to 'Home Improvement' CONGRATS!
not sure if I missed it or not but just in case...
I did not read any plans to properly vent that tank and the basement itself.
Any electronic equipment and metal surface for that matter will eventually become victims of humid
ity and salt corrosion, including the washer and dryer without proper venting, especially in a basement.
The best advice I can provide is to enclose the back of the tank and throw a humidifier in the enclosure or look into getting a decently sized dehumidifier.
I would inquire with the forums for feedback on long term performance of dehumidifiers and ceiling exhaust fans in saltwater applications. i know people use dehumidifiers in their fish rooms but the internal components were not meant for saltwater, could not tell you how the units hold up to saltwater evaporation and a good unit runs about $400
or possibly a ceiling vent/fan like in a bathroom?
maybe something like this - http://www.homedepot.com/p/Delta-Br...Bath-Fan-VFB25ADH/203314717?keyword=203314717
I used one of those cheap bathroom fans on my build. Right side of the tank near the top. It rusted and died after about 2 months
The new build is looking great