As far as looks go, this app has amazing graphics. The fish look and move incredibly realistically and the coral decorations, bubbles and light-ripple effects are probably the best I've seen in any aquarium app, though I find that the bubble sound effects actually get on my nerves rather than soothe me; it's too fast and high-pitched. While Marine Aquarium looks great, its shortcomings are in its complete lack of features. Basically you just watch the fish and you can control the brightness of the background and foreground. There's no interaction with the fish and you can't choose which types you want in the tank as it randomly generates different fish everytime you open the app. The lack of tank customization is another thing. You're stuck with one coral reef and one gradient background and it can become boring after a while. There are far better aquarium simulations available in the app store, however, if you're just looking for a pretty scene to look at and you don't care about the camera following fish, feeding them or any of that, then this app certainly achieves it, all while looking incredibly gorgeous. Bottom line is: it's basically like a 3D fish screensaver (and maybe that's what the developers were going for). If you're looking for interaction and customization, keep searching; but if all you're after is a realistic fish scene, look no further.