This is the client app for the open source Aquarium Control project.
The pairing of the app with the controller and the workflow are described here: https://youtu.be/TI59Z_V8Q-A
For experimenting, you can use the demo server.
Go to "Select Controller" and create a new controller with the following parameters:
server address: vps2483992.servdiscount-customer.com
Port: 80
Username: demo
Password: demo
After creating the controller profile, select the controller. Then all features of the controller will be available in the main menu of the app.