$$$$Lots Of Shells$$$$
This is not really a cheat, more of a glitch in the game.
Create a new account and name it anything you like. Make sure it is an account you don't mind deleting. Close out of insaniquarium and go to My Computer, Local Disc C, Program Files, Pop Cap Games, Insaniquarium, User Data. Then open up the file named: user[highest number] in notepad or any other writing program. Then delete all information on that file and save it to the same name in the same folder. When you go back into insaneaquarium there will be a huge number in the virtual tank and bonus adventure. If you try to access bonus adventure the game will read it as a glitch and close.
Added by: slamal Nov 29th 2009, ID#14452