I have a multiscreen display and thought it would be cool to have this running on my MBP monitor while I was working. By going to the menu bar at the top of the screen I found "About Real Aquarium HD" or "Quit." No preferences option... Really? So I quit... and ultimately, deleted it. Also the video wasnt what I would call "HD" - maybe it would have looked better on the MBP but on my 25" monitor is was not very impressive. I was fortunate to get this app for free and in all honesy, I probably would have kept it as I liked the concept but as I have an SSD for my main drive this was 2GB that I wanted back.