j-lor;2926294; said:What if i only fill the tank up half way?
I've thought about this myself.... but I know myself too well. I'd start filling it only half way for a while. Then the tank would get a little more filled.... then a little more.... but within a year, I guarantee that I'd be filling that tank to the brim.

As for the big tank, I really think the answer is going to be a solid "no". It's a bad idea to just do it without knowing how the building was built, and to get that knowledge, you'll probably have to go through the landlord.... who'll almost definitely shoot you right down.
-Ryan