Tank placement in front of A/C return?

[Cuso]

Just happens that my previously planned spot for the reef tank in the new house had an a/c return put right behind it...it's a RSR350 so mostly enclosed sump compartment. Any potential issues to consider with this being behind the tank with the salt, moisture, evaporation, etc.?

 

[Formulator]

I would just put a plastic vent louver over it. Maybe paint inside the metal duct a few inches with Kilz or plastidip. Your biggest issue will be rust. I had a painted metal vent just near my basement fish room and it completely rusted over.

 

[ZoWhat]

Could rust out your $8,000 furnace with salinity moisture circulating