Fish Paradise Gallery
Here are some screenshots - which you can take in game which is really cool! And just to let you know - the ones with the same background are the same reefs - they just have different fish in them and/or more or less decorations (coral, plants, and structures).
I learned that you could position the fish! You can probably tell which ones I did that to!
So, if you'd just like to see the themes without the fish, here are most of them. I have not bought all of them yet - they charge gems for all themes!