Melonbob
Reef enthusiast
removing the door, and the door frame is going to give you at least 3" You will have a 2x4 on either side of the door, they are 1.5" wide. Remove the trim, and you will see what I'm taking about. If you are careful, you can do this without damaging drywall, slide your tank in and replace the frame. I definately would not give up on a 500g tank over 3 inches!