No not crazy at all. I had a 450 gallon + 225 gallon and a 45 gallon in my 2 bedroom ground floor condo suite. As long ur on ground floor and building manager allows it then u should be good. I say "Do it!" =)
Another thing is make sure the tank fits through your door to get into the apt. Standard door size width is 36" but u have to minus 4" from the side door moldings. It's around 32-33". Trust me make sure it fits before buying it. I've moved a 450 gallon thru my door before but had to move the tank on its side cuz it wouldn't fit.