Below is an example of a basic HTML file for a mini aquarium simulator using popular freshwater game fish:
```html
Aquarium Simulator
```
This example creates a basic aquarium simulator with the following features:
* Fish swimming around the aquarium with different behaviors.
* Plants swaying at the bottom of the aquarium.
* Bubbles rising from the bottom of the aquarium.
* A "Feed the fish" button that makes the fish swim towards the food.
* A "Tap the glass" button that makes the fish swim away from the tap.
* A water color select menu that allows you to change the background color of the aquarium.
You can save this code as an HTML file and open it in a web browser to see the aquarium simulator in action.