A quiet lagoon
Describe your tank once: volume, type and water values. FinHaven remembers, and tells you when the water is drifting or the tank is filling up.
A quiet place for your freshwater tank
FinHaven
Describe your tank once. FinHaven keeps the water log, walks you through day-by-day care rituals, knows thirty-five species by name — and wakes the Sage when something looks wrong.
Free
35 species
4 care programmes
No account needed
How it works
Four quiet steps
The same four moments you meet the first time you open the app.
Know your dwellers
Thirty-five freshwater species with honest notes on temperament, water and tank mates, grouped by the rivers they come from.
Rituals, not chores
Four day-by-day programmes, from the first four weeks to a ten-day rescue. Tick tasks, keep a streak, earn pearls.
Wake the Sage
Ask anything, describe symptoms, or request stocking ideas for your exact tank. Answers come from OpenAI, and nothing is sent until you ask.
Features
Everything a tank needs, nothing it doesn't
Five tabs — Lagoon, Species, Care, AquaSage and Pearls — and no account, ever.
Water log with safe bands
Log the six values a home test kit reads. Each one is checked against your tank's own band, and a trend warns you before a number becomes a problem.
NH₃NO₂NO₃pHTempdGH
Day-by-day care programmes
Four programmes laid out task by task, with a note on why each step matters. Tick a day, keep the streak, and get a gentle 9:00 reminder for the rest.
28-day cycleWeekly ritualPlanted starterFish-in rescue
Species atlas
Thirty-five freshwater fish with temperament, water range, school size, diet and tank mates — grouped by the rivers and lakes they come from.
7 families4 regionsHonest notes
Bioload & peace check
Add dwellers to your tank and FinHaven weighs the load against your litres, flags mismatched water, and warns when temperaments won't mix.
Stocking meterTank peaceChange calculator
AquaSage
Ask a question, describe symptoms for a diagnosis, or get stocking ideas for your exact tank. Powered by OpenAI; nothing leaves the phone until you ask.
AskDiagnoseStocking Advisor
Pearls & keeper ranks
Fourteen pearls surface as you keep the tank — first splash, cycle master, perfect month. Streaks and ranks make the habit stick.
14 pearlsStreaksFry → Aquarist
6 care guides
A new tip every day
Gentle 9:00 reminders
°C / °F · litres / gallons
Everything stays on your device
Care
Rituals, not chores
Each programme is a calendar of small, explained tasks. Blurbs are the app's own.
28DAYS
New Tank Cycle
Four weeks that grow the bacteria a tank lives on, before a single fish arrives.
7DAYS
Weekly Maintenance Ritual
Seven light days that add up to a tank that never needs a rescue.
14DAYS
Planted Tank Starter
Two weeks that carry new plants through the melt and into growth.
10DAYS
Fish-In Rescue
Ten days of daily changes that carry fish safely through an uncycled or crashed tank.
Species
Know your dwellers
Thirty-five freshwater species, grouped by the waters they come from.
South America· Amazon, Orinoco, Rio Negro
Southeast Asia· Mekong, Sumatra, Ganges
Africa· Malawi, Tanganyika, Congo
Central America· Yucatán, Honduras, Caribbean
Neon Tetra
Paracheirodon innesiPeacefulAngelfish
Pterophyllum scalareSemi-aggressiveBetta Splendens
Betta splendensAggressiveGuppy
Poecilia reticulataPeacefulGerman Blue Ram
Mikrogeophagus ramireziPeacefulCardinal Tetra
Paracheirodon axelrodiPeacefulYellow Lab
Labidochromis caeruleusSemi-aggressiveDiscus
Symphysodon aequifasciatusPeacefulKribensis
Pelvicachromis pulcherSemi-aggressiveClown Loach
Chromobotia macracanthusPeacefulZebra Danio
Danio rerioPeacefulConvict Cichlid
Amatitlania nigrofasciataAggressiveEmber Tetra
Hyphessobrycon amandaePeacefulEndler's Livebearer
Poecilia wingeiPeacefulMolly
Poecilia sphenopsPeacefulTiger Barb
Puntigrus tetrazonaSemi-aggressive
AquaSage
Wake the Sage
An aquarium keeper you can ask anything. It reads your tank card and your latest water test only when you ask — and answers like a friend who has kept fish for twenty years.
Ask
Cloudy water, a new fish, a filter that hums — ask in plain words, get a plain answer.
Diagnose
Describe the symptoms and the Sage tests the water first — because most "disease" is really ammonia.
Stocking Advisor
Ideas for your exact litres, temperature and current dwellers — never a fish that won't fit.
AquaSage
Reads: Reef Corner · 120 L · last test todayWhy did my water turn cloudy?
A bacterial bloom is the usual reason in a young tank. Feed less, skip a day, and it clears on its own within a week.
Nothing is sent until you ask
Fourteen pearls to surface
Each one marks something real you did for the tank.
Fry→Juvenile→Aquarist
First SplashSet up your tank in the Lagoon
Full HouseFive different species in one tank
Shoal KeeperSix or more of a single species
Cycle MasterFinish the New Tank Cycle
Crystal ClearTen water changes done
Streak of SevenA task on seven days in a row
Bookworm FishOpen every care guide
World ExplorerA species from all four regions
Sage's ApprenticeAsk the Sage your first question
Doctor FinsRun your first diagnosis
Perfect MonthThirty days without a skip
Lab CoatLog your first water test
Steady HandsFive safe tests in a row
Grand AquaristFinish all four programmes
Contact
Write to the keeper
A bug, a species you'd like added, a programme that didn't fit your tank — we read everything. Or email us directly at akuredapim816@gmail.com.
Fill your lagoon
Free on the App Store. No account, no sign-in — your tank, your log and your pearls stay on your phone.
Download on theApp Store