What about fish ville?

Answer 1

Fishville is a game where you get fish, feed them, and then sell them for money. It is made by Zynga and is playable of Facebook.

Question was: how do you get sand dollars?

You get your freinds to send you a mystery box and in there, occasionally, you get sand dollars. you can also get them from the treasure chest you can have in your tank. from both these things you either get coins, XP of sand dollars. although it is no-where near 1/3 sand dollars you do get one occasionally.