Salty150
New member
For once, common sense.
You need depth to be able to create some decent rockwork and still have some free space in the front.
Then you want as much real estate for corals as possible. Most fish also prefer to have more room to the back.
Then it's pretty much the standard recommendation I found in most of my (mostly German) books.
You will find this ration also if you look at many reef tanks around here, especially with coral centric tanks.
Also, personal experience has taught me that this is the ideal ratio. Of course only up to a certain length. A depth of much more than 3 foot becomes quickly unmanageable for a home tank - exceptions are room dividers where you have access from both sides.
OK, I have never heard anything like that - other than fish need more room to swim than corals need room, etc...
But I have never heard anyone say that a 48" long tank (24" wide) is better than a 60" long tank (18.5" wide) where fish are concerned.