Aluminum Refugium is it safe?
 

Im a fabricator so i was wondering if an aluminum refugium would be a good idea?

Probably not :)

Allum and saltwater don't mix!!!

Would sealing it work? I'd suggest a Rubbermaid container for less $$ or even a second hand bare tank.

I would avoid it all together, just go and get a cheap used tank or a rubber made.

If you are using an alloy and even to an extent pure (ish) aluminum, it can contain copper, zinc, manganese, and a whole host of other element.

Al corrodes in saltwater. Thats why al fish boats and lower legs from outboards have a zinc piece bolted to them. It becomes the sacrificial anode and corrodes first. You don't want zinc in your tank either