First, connect the game to your Facebook account. This can be done in the game settings.
Once you're connected to Facebook, do the following:
1. Click the Friends button above the Settings button in the left part of the screen to see a list of your friends who have Fishdom aquariums.
2. Click the Invite Friends button at the bottom to add your Facebook friends.
3. Select the friends you'd like to invite to the game by clicking [+] in the right part of the window.
4. Click Send.
Once you're connected to Facebook, do the following:
1. Click the Friends button above the Settings button in the left part of the screen to see a list of your friends who have Fishdom aquariums.
2. Click the Invite Friends button at the bottom to add your Facebook friends.
3. Select the friends you'd like to invite to the game by clicking [+] in the right part of the window.
4. Click Send.