Mine is also I think 48". But the question is whether you plan to have a couch in front of it, what equipment you want under it, etc. Before bulding my new inwall dual sided tank, I used blue painters tape to tape the regtangle opening on the wall and left it like that for a week or two to see how I liked the eye level from around the room. Once I was sure of the height, I set the height for the stand. Also, since my tank is dual sided, on the living room side I plan to have a couch on the wall in front of it, so I needed to make sure the bottom of the tank would be enough above the top of most standard height couches. I had less concern about inside stand space as only plumbing is under the cabinet -- all equipment is plumbed out the side wall and on the side of my house. If you are trying to fit a skimmer, than take into consideration what model you plan to use.