There is a 2011 Maintenance in April 21, 2011 and they were adding new Spring items and the game gone down.
Cat Denton looked at Happy Aquarium and they said that Happy Aquarium has gone under maintenance.
- Frog Counters are frozen this time, so your progress will be saved.
- The Sunflower Fish are released.
- The Peek-a-Boo Egg is released.
On the maintenance, nine people are in the Aquarium with a Big Tank and from left to right are nine Bluefin Tuna, a Great White Shark, a Blue Humpback Whale, two Orange Jellyfish, an Eagle Ray, a Green Sea Turtle, two Clown Triggerfish, four Moorish Idols and four Clownfish.