Scientific method..?

Question

two fish are placed in an aquarium.both are of the same kind and came from the same environment,but one dies after 5 days.

Answer 1

Get another fish to fill that hole in your heart left by your dead fish.

Answer 2

1. state the problem

2. gather info

3. form a hypothesis

4. perform experiment

5. draw a conclusion

If your trying to find the other stuff like the control, variable, etc. you don't have enough info