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Keep track of your aquarium

Log water and fish, plan your next tank and look up thousands of species.

Get startedExplore the species
  • 4,325 species
  • 18.6M sightings
  • 246 countries
  • 5 languages
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An aquarium on a large screen, with its report, activity and fish
An aquarium’s report, with traffic lights for the water and the fish

Water test

Stua, yesterday

Everything suits the 8 species in the tank.

  • Temperature 25 °C
  • pH 6.8
  • Nitrite 0
  • GH 8
Photo: Shamsuri Azmi / PexelsPhoto: George Wong / Unsplash

Explore 4,325 species

Look up a species and see how it likes to be kept, or let the wall below tempt you. New species every day.

  • 3,589fish
  • 75invertebrates
  • 91corals
  • 570plants

Species of the day

Photo of Reganochromis calliurus
Freshwater

Reganochromis calliurus

Temperature23–28 °C
pH7–8.5
Length15 cm
TemperamentSemi-aggressive
Photo of Sixspine butterflyfish
Saltwater

Sixspine butterflyfish

Parachaetodon ocellatus

Length18 cm
TemperamentPeaceful
Photo of Asian redtail catfish
FreshwaterBrackish

Asian redtail catfish

Hemibagrus nemurus

Temperature22–25 °C
pH7–8.2
Length65 cm
TemperamentSemi-aggressive
Photo of Awlwort
Freshwater

Awlwort

Subularia aquatica

Photo of Caulerpa sertularioides
Saltwater

Caulerpa sertularioides

LightMedium
CO₂Not needed
DifficultyEasy
GrowthHigh
Photo of Beaked tasselweed
FreshwaterBrackish

Beaked tasselweed

Ruppia maritima

Photo of Hairy mushroom
Saltwater

Hairy mushroom

Rhodactis inchoata

LightLow
FlowLow
DifficultyEasy
Temperature22–26 °C
Photo of Black devil snail
FreshwaterBrackish

Black devil snail

Faunus ater

Temperature22–28 °C
pH7–8.5
Photo of Sally Lightfoot crab
Saltwater

Sally Lightfoot crab

Percnon gibbesi

Temperature22–26 °C
pH8.1–8.4
Length8 cm
Photo of Zebra nerite snail
FreshwaterBrackish

Zebra nerite snail

Neritina natalensis

Temperature22–28 °C
pH7–8.5
Did you know?

Species from all over the world

The species live wild in 246 countries.

Species per country11,168
See the map in the app

Gathered from researchers around the world

We have gathered, cleaned and pieced together species data from scientific databases all over the world, and translated it into your language, so you do not have to look.

18.6 million

sightings in the wild are behind the maps of where the species live

58,923

places where the species live

21,794

names in five languages

3,881

texts about the species

5,202

photos of the species

On top of that, we have gone through water values, care and which species get along by hand.

Good to know

All articles
Fishless cycling4 min read

Step by step: how to cycle a new tank before the fish move in, how long it takes, and how to speed it up.

How to add new fish4 min read

From the store to the tank: how to get the fish used to your water, why you should add only a few at a time, and what to watch for in the first few days.

Quarantine for new fish3 min read

Why new fish should live in a tank of their own for a few weeks before they move in, what you need, and what to look for.

The app

Your aquarium, always in your pocket

Water tests, water changes, fish and plants in one place, with clear answers on what goes together and what needs doing.

  • Free to get started
  • Nothing to download, it runs in your browser
  • On your phone and your computer
Get started
An aquarium cycling, with ammonia and nitrite on a chart
The page of the neon tetra, with its photo, names and the aquariums it is in
The map, with a globe of where the aquariums’ species live

Everything your aquarium needs, in one place

  • Water values in plain words

    Green, yellow or red for your very species, and one sentence on what to do.

  • Fish that get along

    See whether fish thrive together before you buy them.

  • A safe cycle

    Follow a new aquarium through its cycle, step by step.

  • Plan before you buy

    Build the aquarium around a species or a region, and get a shopping list that fits together.

  • Where species live

    See on a map where your fish and plants come from in the wild.

  • Names in your language

    Species in your own language, with the scientific name in small print below.

How to get started

  1. 1

    Create the aquarium

    Give it a name and say how big it is. The rest can wait.

  2. 2

    Add fish and plants

    Search thousands of species and see right away whether they get along.

  3. 3

    Log the water

    Enter a water test, and we tell you if anything needs doing.

Ready to get started?

Getting started takes a couple of minutes.

Get started