My wife and I moved from DC 4 years ago back to Ohio where we both grew up, and just returned. Life was simply better here.
Anyways, when I lived in DC before, I only kept a small tank. In Ohio, I put up a Red Sea Reefer 450, which is about 92g in the DT and 25 or so in the sump. I put that in storage and set up a small tank in the mean time. Right now I am in NOVA, staying with my brother, and instead of moving that much livestock, I basically kept hardy things that I didn't want to rebuy and threw it all in a 20g Long DT and Sump (fill to the rim with LR). We are looking for condos right now in the city and I would love to be able to put up my RS reefer again when I move all my crap.
Right now, we are wanting to buy a condo in a high rise, which should be fine for a big tank since they all have concrete flooring, but how much of a PITA would it be to keep a tank that size in the city? I can't imagine it being much different than a small tank, just more water to make... but wanted to see if anyone had personal experience with it.
BTW, here is my tank the day before I sold most of my coral. and then my 20g Long from several weeks ago. Things are growing well in the 20g and should have some frags available soon.