Coins are a type of in-game currency used to buy new decorations and, of course, fish. Here’s how you can get more of them:
1. Play match-3 levels. Beating them earns you coins.
2. Feed your fish and your friends’ fish. Happy fish reward you with a few coins.
3. Clean your aquarium on a regular basis. You’ll get coins as a reward.
You can also sell decorations you no longer need.
BEAR IN MIND, however, that your Beauty decreases with each sale and you’re only reimbursed half the original price.