reef tank over top of fire place

[DiverDude]

Anything is possible -but is it smart ?

Aside from the potential issues from a failure of some sort, how would you get at it to clean and tend to it ? Working on a step ladder would be a bitch.

Where would the sump go ?

etc.

etc.

If it's *that* desirable to you then I'm sure you could pull it of. Personally, I'd suggest that you can find other places that are almost as nice but far more practical.