The Aquarium

Give your pets a pet! The Aquarium is your own fish tank: collect fish, keep them fed and the water clean, decorate the tank, and fill out your Fish Collection log. Fish are a relaxing side hobby — your main pets always come first — but a thriving tank pays your active pet back every day.

Where to find it

• Direct link: /aquarium/ (also under the Pets menu). The menu entry carries a badge: (Get) until you own a tank, then the lower of your two care meters — so (25%) means the food or the water is down to a quarter. Hover it to see both numbers.
• Fish and supplies are sold at the Aquarium Shop, run by Gill — a shark who gives you his word he has never once eaten the merchandise.

Getting started

Your first tank is the Starter Bowl. It holds 5 fish and 3 decorations, and there are two ways to get one:

• Pay 5,000 MPC on the Aquarium page — instant, always available.
• Use a Starter Bowl item — sold at the Aquarium Shop and fully tradable, so you can gift one to a friend, sell one in your shop, or hunt for a bargain from other players. Using it sets up the same tank for free (it has no effect if you already own one).

When you outgrow the bowl:

• Small Tank — 15,000 MPC, holds 12 fish and 5 decorations.
• Large Tank — 40,000 MPC, holds 50 fish and 10 decorations.
• Grand Tank — 100,000 MPC, holds 100 fish and 15 decorations — room for the whole collection, with space left over for spares and hatched morphs.

Upgrades go one tier at a time and keep all your fish and decor.

A new tank comes with a full Food meter — your first fish gets a free 24 hours of food, so there is time to pick up a tin of Fish Flakes before anyone gets hungry.

Fish come in bags

Every fish you buy, catch or trade arrives as a bagged fish in your Backpack — a water-filled travel bag, just like a real pet shop. Bagged fish are ordinary items: you can sell them in your shop, auction them, or hold onto them.

Adding a bagged fish to your tank lets it swim, earn a nickname if you like, and count toward your collection. The Add to Tank button is on the Aquarium page and right on the fish in your Backpack.

Not sure which bags are worth adding? Every bagged fish carries a collection hint, both in your Backpack and in the backpack strip on the Aquarium page: New species for your tank! means you have never had that species swim (adding it counts as a discovery), Discovered, not in your tank means you have collected it before but nothing of that species is swimming right now, and Already in your tank means a copy is in the water (with a count if there is more than one).

Taking a fish out — click any fish in the tank and choose Move to Backpack to scoop it back into a travel bag. Bagged fish can be sold or traded again like any other item. The fish loses its nickname on the way out, but its species stays discovered in your collection forever.

Fish details — clicking a fish in the tank also shows its species, rarity, how long it has been in your tank, and whether it's hungry.

Your Fish

Fish tend to pile up on top of each other in the water, so the Your Fish section under the tank gives every resident its own card: nickname (or species, if it has no name yet), rarity, how long it has been in the tank, and its status — hungry or well fed, resting, on the nest, hatched morph. Name this fish / Rename opens the same details you get by clicking a fish in the water, and Move to Backpack scoops that particular fish out from the card. Two Marble Angelfish get two cards, so you can always tell them apart. Rarest fish come first, with the same species side by side, and once you have six or more fish a search box finds one by name, species or family.

Getting fish

• The Aquarium Shop stocks common and rare fish on the hourly restock, plus decorations. Fish Flakes turn up there on the hourly restock like everything else — a tin lasts weeks, so there is no rush, and Findley can watch for one if the shelf is bare. Findley can watch specific fish for you.
• The Fishing Pond — every successful (non-miss) catch has about a 12% chance of also hooking a keeper: a bagged fish added to your backpack. A perfect catch lifts that by half again. The better the catch you reeled in, the better the keeper can be — epic and legendary aquarium fish are only found this way, and hooking the Legendary Whale gives you the best odds of a legendary keeper. You can hook at most 4 keepers a day, and about half of the keepers you hook favour species you haven't discovered yet.
• Other players — bagged fish can be bought from player shops and auctions like any other item.
• Events — the Lilypad Goldfish is an epic goldfish that only came from The Community Pond event. It never drops from fishing or appears in a shop, so the only other way to get one is from a player who earned it.

The Fish Collection

There are 56 fish species to discover: 16 common, 20 rare, 14 epic and 6 legendary — including 24 morphs that only hatch from a Fish Nest. The collection log on the Aquarium page shows every species you've discovered (a fish is discovered the first time it swims in your tank, and each first-time discovery earns your active pet 20 XP) and a mystery card for every one you haven't — with a hint about where it comes from (morph cards tell you which pair to nest).

Each discovered card also says how many of that species are swimming right now and how many you have bagged, or Not in your tank if you are not keeping one.

Caring for your fish

Fish never die in MiroPets — but a neglected tank is a gloomy one, and only a well-kept tank gives out bonuses.

• Feeding — one pinch of Fish Flakes feeds the whole tank for 24 hours; the Food meter at the top of the page drains as the day goes on. Flakes are the only way to feed a tank, so keep a tin in your Backpack. A tin of Fish Flakes holds 25 feeds and costs 500 MPC at the Aquarium Shop — under a month of feeding for one tank, and the Aquarium page counts the feeds you have left rather than the tins. Sprinkle them with the Feed button, or with Sprinkle in Tank on the flakes themselves further down the page: the flakes sink through the water and your fish break off to chase them down. You can top the tank up again once the Food meter drops below 50% — feeding a full tank would only waste the flakes. A tank you have just set up starts out full, so your first feed is not due for a day. Hungry fish turn pale and mopey.
• Growing up — fish start small and grow to full size over their first two weeks in the tank, then fill out a little more over the following weeks. Moving a fish to your backpack resets its growth.
• Cleaning — the water slowly gets murky over about 4 days. The Clean Tank button is free and instant.
• A tank that is both fed and clean is thriving — and that's when the good stuff happens.
• You do not have to open the page to check: the Pets menu shows whichever of the two meters is lower.

Fish Nests — hatching morphs

Some fish can't be bought or hooked at all. Morphs are new colour varieties that only hatch from a Fish Nest — 24 of them across 12 families: 11 rare, 9 epic and 4 prismatic (legendary-tier).

A Fish Nest costs 2,000 MPC at the Aquarium Shop, or you can trade spare fish for one at Gill's Counter (below). One nest is used per hatch, whether or not anything hatches.

Two kinds of nest. A Coral Fish Nest (6,000 MPC at the Aquarium Shop or the Nesting Nook) hatches the very same morphs with double the odds — 70% for a rare morph, 50% for an epic and 40% for a prismatic. You pick which nest to use when you choose your pair. Everything else is the same: one nest per hatch, the same wait, both parents still rest afterwards, and a miss still counts toward your guaranteed hatch (so if your next hatch is already guaranteed, a plain Fish Nest will do).

How it works

1. Your tank must be thriving (fed and clean).
2. Press Choose a pair in the Fish Nest panel and pick two fish that are swimming in your tank. They must be from the same family (two Guppies, two Koi…) — the picker tells you what the pair would hatch and the odds before you commit.
3. The nest sits on the gravel for 8 hours. When the eggs are wriggling, the Aquarium entry in your menu shows (Nest ready) and Gill sends you a message — head back and press Check the nest.
4. If it hatches, the morph swims straight into your tank (or arrives bagged if the tank is full) and counts as a discovery — a first-time morph earns your active pet 40 XP. If it doesn't, nothing hatches this time.

What a pair hatches

• Two commons of a family → that family's rare morph (35% chance, 70% with a Coral Fish Nest)
• Two rares (or a rare and an epic) of a family → its epic morph (25% chance, 50% with a Coral Fish Nest)
• A legendary is a wildcard: it pairs with any fish and lifts the result one step. Legendary + a family's epic → that family's prismatic morph (20% chance, 40% with a Coral Fish Nest). Two legendaries cannot pair.

Good to know

• Nests never fail forever: every 4th nest in a row without a hatch is guaranteed — the panel tells you when your next one is a sure thing. A hatch (guaranteed or lucky) resets the count, so the nest after it rolls its normal odds again.
• Both parents rest for 7 days afterwards. Resting fish can't nest again or be moved to your backpack until they've recovered.
• One nest per tank at a time.
• Hatched morphs are ordinary bagged fish once you scoop them out — sell or trade them like any other. They show a morph tag in the collection log and on the fish itself.
• Morphs can nest too: a rare morph counts as a rare of its family.

Gill's Counter — trading in spare fish

Duplicate fish piling up? Gill takes bagged fish in trade on the Aquarium page (listed or trade-locked copies don't count, and he never accepts hatched morphs):

• 12 bagged commons (any mix) → 1 Fish Nest
• 3 bagged rares (any mix) → 1 Fish Nest
• 5 commons from one family → that family's rare (families with a rare to trade up to: Angelfish, Betta, Clownfish, Goldfish, Koi, Puffer, Seahorse, Tetra)

Pet Visits

Once a day, the Pet Visit button lets your active pet watch the fish in a thriving tank for a happiness boost. It's the whole point of a pet having a pet.

Decorations

The Aquarium Shop sells plants, corals, castles, sunken treasures and a few MiroPets keepsakes — the Sunken MPC Coin, a glowing MiroPets Neon Sign and a stone Gill Statue (Gill sells it with a completely straight face). Place a decoration from your backpack and it lands on the gravel; drag it to move it, click it to send it back to your backpack. Happy with the arrangement? The padlock button in the top corner of the tank (next to the watch-mode button) locks the decor in place: nothing drags and nothing tap-removes until you unlock it, so you can poke around the tank or watch the fish on a phone without nudging anything. You can still place new decor and swap fixtures from the Tank Setup strip while locked. Each tank tier has more decor slots (the Starter Bowl has 3). The Air Stone and the Bubbling Volcano send up a steady column of bubbles.

Current decor: Pebble Cluster (300 MPC), Java Fern (400 MPC), Amazon Sword (450 MPC), Kelp Curtain (500 MPC), Coral Branch (1,500 MPC), Pink Lotus (1,600 MPC), Rainbow Rock Arch (2,000 MPC), Sunken Treasure Chest (2,000 MPC), Air Stone (2,200 MPC), Castle Turret (2,200 MPC), Sunken MPC Coin (2,500 MPC), Sunken Rowboat (2,500 MPC), Glow Anemone (6,000 MPC), Bubbling Volcano (8,000 MPC), MiroPets Neon Sign (9,000 MPC), Gill Statue (12,000 MPC).

Tank Setup — gravel, lights and backdrops

Three kinds of fixture change the whole scene instead of sitting on the floor. You can have one of each installed, and each one takes a decor slot like any other decoration. Install one from your backpack and it replaces the fixture of that kind already in the tank (the old one goes back to your backpack). The Tank Setup strip under your tank shows what is installed and lets you remove it.

• Gravel covers the tank floor in colourful plastic pebbles: Bubblegum Pink Gravel (800 MPC), Ocean Blue Gravel (800 MPC), Rainbow Gravel (800 MPC), Midnight Black Sand (1,500 MPC), Sunset Orange Gravel (1,500 MPC), Glow Gravel (5,000 MPC). Glow Gravel lights up under the Blacklight.
• Lights clip onto the rim and set the mood — warm, moonlit, ultraviolet or colour-cycling: Sunrise Lamp (3,000 MPC), Moonlight LED (3,500 MPC), Blacklight (7,000 MPC), Rainbow Strip (8,000 MPC). The Blacklight makes Glow Gravel, the Glow Anemone and the MiroPets Neon Sign glow.
• Backdrops slide in behind the glass and replace the open water with a printed scene: Coral Reef Backdrop (2,500 MPC), Tropical Lagoon Backdrop (2,500 MPC), Sunken City Backdrop (3,000 MPC), Deep Space Backdrop (6,000 MPC).

Watching the tank

The tank fills the page, and the fish spread through the whole scene with a sense of depth — fish further back swim smaller and behind the ones in front, and a crowded tank draws everyone a little smaller so a full Grand Tank still reads as a school, not a pile. The button in the top corner of the tank opens watch mode, a full-screen view of your aquarium (Escape or the same button leaves it). Watch mode works on public tank pages too.

Show off your tank

Every aquarium has a public page at miropets.com/aquarium/your-username — visitors can watch your fish swim and see who's in the tank, complete with nicknames. A tank card also appears on your profile. Who can see it follows your profile visibility setting.

Related pages

• The Community Pond
• Shops
• Findley
• My Shop
• Backpack and Items
• Pet Care Basics