Without knowing the aspect ratio, we can't determine the exact dimensions of an 800 gallon tank. However, we can make some general assumptions. A tank with a square base will have the largest surface area for a given volume. A tall, narrow tank will have the smallest surface area for a given volume.
As an example, let's assume that the 800 gallon tank has a square base. The volume of a square tank is calculated by multiplying the length by the width by the height. In this case, the volume is:
```
800 gallons = length * width * height
```
Since the base is square, the length and width are equal. Let's call this value "x". The height of the tank is then:
```
height = 800 / (x^2)
```
If we assume that the tank is 2 feet wide, then the length and height are:
```
length = 2 feet
width = 2 feet
height = 800 / (2^2) = 200 feet
```
So, an 800 gallon tank with a square base could be 2 feet wide, 2 feet long, and 200 feet high. This is just one possible set of dimensions, however, and the actual dimensions will depend on the aspect ratio of the tank.