Need help from the experts.
I have two walls that I am thinking of putting the new big tank on.
Both have walls that can be ran through so that I can put the 55g fuge and the 30g sump in different rooms from the main viewing tank.

1) One wall is the outside wall for the garage. Meaning the viewing tank would be in the house and the sump / fuge would be in the garage, in the elements, cold and heat. I am thinking I would have to put a window unit in the summer and a heater in the winter if I do this. Anybody doing this?

2) The best wall would have the main tank in the formal entrance and the sump / fuge would be in a sealed closet under the stairs.
It has a tile floor but doesnt have a vent or duct bringing air in or out.
There is pleanty room here and water accesibility and drain are very easy to get to. I could hook up the RO system up an auto top off would be real easy. (Alex, kind of like yours)
My questions is here is, is the sealed closet a problem for heat and moisture. Would I have to install some sort of vent / air exchanger?'
The room is about 4 foot wide and 8 foot long, I have already measured and the 55g fuge and 30 gallon sump fit fine.

In the groups opinion, should I use the garage of the stair closet?

Please advise, I really value this groups opinion.

Thanks,
Mike