This is not hack . Just a trick .
With this trick you will quickly make your aquarium happy.
1) Firstly , Go to Happy Aquarium
2) Click above on "Free Gift" and open it in a new tab, choose a gift you like and click "Proceed to Send"
3) In the new open page do not click on send.
4) Open a new tab (as many as you want) and repeat the steps 1 and 2.
4) Finally, in each tab click Send. R2O-Hacks.blogspot.com