Joyquarium

Joyquarium takes the oldest idle-game premise there is, buy low, grow, sell high, and moves it into a fish tank that never needs cleaning. Easyfun Studio's fish-raising idler, published by Gamersky Games in March 2025, is explicitly pitched as stress relief: feed your fish, watch them scramble for food, sell the adults or keep them for passive income, and redecorate the tank with real aquatic plants between harvests. Its Very Positive rating comes from a small review base, which is the honest footnote to every number that follows.

What the loop feels like

You buy a pack of fry, sprinkle food, and watch the little swarm go berserk over it. That's Joyquarium.

The grown fish hit market price, you sell a few, keep a few as earners, and the tank's income starts compounding. That's Joyquarium.

You spend the profits on wisteria and a strange-looking stone, rearrange the aquascape, and discover an hour has vanished into white noise. That's Joyquarium, and it is one of the few idlers where the decoration spending is not a cosmetic afterthought but the stated reward.

The systems under the water

The economy layer is a clean breeding loop: fry are bought in packs, raised to adulthood, then either sold for cash or retained in the tank as income generators, which turns every purchase decision into a portfolio question. The Auto-AFK function is the automation valve, letting the whole feeding and selling cycle run unattended, and the game is upfront that manual and idle modes coexist without punishing either.

The collection layer gives the loop its long game: 144 fish species at launch with more planned, unlocked through tiered fry packs, with rare shiny and colour variants, and the prospect of hatching a Fish King as the collection's white whale. The decoration layer is the deep one: a catalogue of real aquatic plants such as water wisteria, Rotala rotundifolia, Ludwigia repens and Hygrophila polysperma 'Roraima', plus driftwood in different postures and landscaping stones, all freely placeable with adjustable colour, size and position. The aquascaping is genuinely the sandbox, and the white-noise ambience is designed to make leaving the game open feel like an amenity rather than a chore.

Where it stumbles

The mechanical depth is modest: the buy-grow-sell curve is satisfying but shallow compared to the collection-and-management hybrids on this site, and once the AFK function is on, your decisions thin out to pack purchases and redecorating. The review count is small, so the Very Positive verdict rests on a modest sample. Players who want progression pressure or prestige systems will find nothing pulling them forward once the fish catalogue nears completion. It is a vibe-forward idler, and the vibe is doing most of the work by design.

Playing it today

Live on Steam for Windows at a modest price, single-player with Steam Cloud and achievements. The platform check found no iOS or Android release by the same developer, so there is no legitimate mobile version to link. Fully offline once installed, and happy to run on a second monitor all day.

The verdict

A purpose-built relaxation machine: the fish economy is just deep enough to feel like progress, the collection chase is real, and the aquascaping tools are better than they needed to be. If cozy idle is your lane, this is an easy recommendation at its price. For more animal-flavoured collecting, Tiny Pasture herds the same instincts onto your desktop, and Time Is Honey swaps fish for bees with the same gentle math.