To find the number of neon tetras that can be accommodated in the aquarium, you can divide the total volume of the aquarium by the volume of water each tetra needs.
Given:
- Total volume of the aquarium = \(1 \times 10^5\) gallons
- Water needed per neon tetra = 1.25 gallons
Now, calculate the number of neon tetras:
\[ \text{Number of neon tetras} = \frac{\text{Total gallons}}{\text{Gallons per tetra}} = \frac{1 \times 10^5 \text{ gallons}}{1.25 \text{ gallons/tetra}} \]
Performing the calculation:
\[ \frac{1 \times 10^5}{1.25} = 8 \times 10^4 \]
So, the aquarium can hold \(8 \times 10^4\) neon tetras.