Dehumidifier in a Fish Room

[MarkoD]

I don't really know the specifics. The room is naturally cool (3 exterior concrete walls and interior wall is insulated) and there are no windows. Running LEDs even as room lights to avoid introducing heat

My main goal is to keep the humidity in the room as low as possible to lower the risk of anything being effected by it.

In my old house. I noticed that drawer handles had started feeling rough (like sand paper) even tho they were about 20 feet from the tank.