Online Fish Aquarium: Every Fish Has an Owner

Up to three per account — fish and the other pets count together. They all live in the same tank as long as it has room, so they’re easy to find — the “Go to my fish” button opens exactly that tank. To free up a place, you can give a pet to a friend or release it.

Open your fish’s card and tap “Give as a gift”: you’ll get a link that works for a week. Your friend opens it, signs in and accepts the gift — the fish moves to their tank and your place frees up. Until the link is accepted, you can cancel it.

A fish starts out as a fry at 12% of its adult size and grows along the von Bertalanffy curve, like a real fish: fast in the first weeks, then slower. Neon tetras and bettas are fully grown in about 120 days, angelfish in 240, and discus and goldfish in a year.

One feeding costs 150 tokens and adds 5 days of growth, but never past adult size. You can feed any fish in the tank — whoever feeds it pays, and the fish’s feeding counter goes up.

No. Each fish has a recorded birth date, and each breed has a typical aquarium lifespan: from 2–3 years for guppies to 10–20 years for goldfish. For now, these lifespans don’t affect anything.

Anyone who opens the fish’s tank sees its name and the owner’s name. You can hide your name when you buy the fish or later in “My fish,” and the fish’s name goes through a profanity filter; an inappropriate name can be reported.

No: the breed, color, pattern and shape are chosen once, just like with a real fish. You can change the name and whether your name is shown — that’s why the preview in the designer shows the fish both as an adult and as a fry.

Each tank holds up to 40 fish — that way it looks alive rather than crowded and opens quickly even on a phone. Flip through the tanks with the arrows, enter a number or search for a fish by name.

The lights follow your clock: from 11 p.m. to 7 a.m. it’s night in the tank, and the fish sink lower and go still, like real ones. The light switch above the tank turns day or night on manually.