Excess moisture in fish room

[jason604]

Just wondering what people with fish rooms do for all the excess moisture. As of right now all I did is installing a 30" vent above my door for the room but it seems to do absolutely nth. I have to leave my room door open buts it's quite noisy and light coming out of the room which I don't want. My fish room use to be a laundry room along time ago so the dryers air vent passage way is still there. I could install one of those washroom fans to it but that would be so noisy and it would be running 24/7 and I don't wanna waste more electricity than I already have. Was thinking about buying this small n neatly lookin dehumidifier

http://www.amazon.ca/gp/aw/d/B00RZVH...s=dehumidifier

What u guys think is it too small? Or u guys have a better solution for eliminating excess moisture?