I didn't have much time to work on this project but I have added the statistics recording.
The wifi module is used to connect to a website hosting a database to record light and temperature levels and provides graphs to display the data.
The database structure is designed to record data from any number of aquarium and owners, so at some point there will be some authentication, API key, ...etc
The website I have created to host this is still very basic : http://www.reeftankalert.com/chart.php