Happy Aquarium: Happy "Fish Snacks", a Solution to Lonely Tanks
One of the ways to earn coins in Happy Aquarium is to regularly visit your neighbors' tanks to scrub the glass and click on the treasure chests (called "Starter Chest" in the game). But when your neighbors are neglecting their tanks, the chests won't refill with gold, and the treasure chests sport a "Tank Needs Love" sign instead. Moreover, with the introduction of the Super Sea Shell Hunt, clicking on treasure chests have become more important than ever, as it's the ONLY way you can collect those shells.
But now, all you've gotta do is sprinkle some of that happy fish
UPDATE: To everyone who loves the new Happy "Fish Snacks" and want more, please note that there's a glitch with this feature! The developers know about this, as people have been loudly complaining on the Happy Aquarium Community (which is the game's official forum). But once it's fixed, we'll have free daily re-fills!