How much space should there be between the wall and the tank on a finished toilet installation? I had flange bolts that were 15″ from the wall so ordered a 14″ rough-in toilet figuring I might then have 1 1/4 -1 /1/2″ gap when I was done. I ended up with a 3 1/2″ gap and am thinking they didn’t deliver what I ordered in the first place. It just seems “too far” away. Any thoughts?