I just built my home and so I built an HRV into the fishroom. It wasn't working right at first and so I used a fan and it didn't quite cut it but it helped a lot. Keep in mind that mine was jury-rigged as I only used it a week.

My bathroom fan in my fishroom was just a $40 unit but over time it started rusting and slowing down. This meant it was running more and more often to maintain my target humidity. When I ripped the room apart I found rusty drip spots on the shelf underneath it. This fan did not stand up well and only operated for 6 months.

Dehumidifier and open all the windows when it's not freezing cold out or raining