* Tank shapes vary: Fish tanks come in many shapes (rectangular, cube-like, cylindrical, etc.). Each shape will have different dimensions for the same volume.
* Height and width impact length: A 150-gallon tank could be long and narrow, short and wide, or something in between.
To find the length of a specific 150-gallon tank, you would need to know its height and width.
Let me know if you have those dimensions, and I can help you calculate the length!