The reason I have given this product a three star rating is because the fish sometimes jitter even on a really good graphics card. I have downloaded this product off the internet before and it was one of the screensavers I had tested to see how it is, in fact it was the second till last one I had bought. It's made by a company called Serene Screen, which sell all sorts of 3D screensavers it even has a goldifh and shark version. But unfortunatly it does not have a wide variaty of fish and you only get one background in this version and no others. That's about all it has so if you have a decent graphics card and want a decent aquarium screensaver to go with it I recommend PC aquarium.