CheckMyFishTankNew Tank Coach
The number one reason new fish die is a tank that is not ready. Log your water tests and the coach tells you, week by week, when it is safe to add fish.
Aquarium care app for Android
Your fish can't tell you what's wrong.
Now your tank can.
Know when a new tank is safe, what your water test really means, and which fish get along. Built on fact checked care for 180 fish, with an expert that knows your tank.
180fish, each checked against 2 or more trusted sources
4 to 6weeks most new tanks need before fish go in
7Pro tools that work on your exact tank
See it in action
The real app, doing the real work
Recorded straight from CheckMyFishTank. No mockups.
Try it now, no download
Will they get along?
Pick any two of our 180 fish. This is the same checker the app uses: water, temperature, size, who eats whom, fin nippers and bullies.
Popular questions:
The Water Doctor
Is your water safe?
Tap the numbers from your test kit. Get a straight answer and the exact step for today, the way the app does it.
Ammonia (ppm)
Nitrite (ppm)
Nitrate (ppm)
Week 1New Tank Coach
Most new fish die in tanks that weren't ready.
Fish waste turns into ammonia, and a new tank has nothing to clean it up yet. The coach reads your tests and tells you, week by week, when it's safe.
Start
Run the filter and add an ammonia source. The good bacteria need food to grow.
Ammonia stage
Ammonia shows up. The first bacteria start eating it.
Nitrite stage
Nitrite appears, which means it's working. Usually the longest wait.
Almost ready
Ammonia and nitrite drop to zero, and nitrate shows up.
Ready for fish
Two clean tests a day apart. Add a few fish at a time.
Free, and actually useful
Everything a fish keeper needs
Water Doctor
Tap in your test results. Get plain answers: what is wrong, why it happens, and the exact steps for today, checked against the fish you actually keep.
Will they get along?
Search any fish before you buy. Get Great match, Risky or Do not mix, with the reasons, based on water, size, temperament and who eats whom.
Pet Store Mode
Standing at the store? Check a fish against your tank and your shopping list, see how full the tank would get, and learn how to pick a healthy fish.
Sick Fish Helper
Tap what you see, like white spots or clamped fins. Get the likely causes and first steps, and know when to get expert help.
Family Feeding
Everyone shares one tank. Tap Fed and the whole family sees Fed by Mia, 8:02 AM. No more double feeding.
CheckMyFishTank Pro
An aquarium expert in your pocket, who already knows your tank.
- Ask the Fish Expert. Answers about your fish, your water tests and your care history. Not generic advice from a search.
- Photo Health Check. Snap a sick fish, cloudy water or algae. Get the likely cause and what to do today.
- Test strip camera. Hold up your strip. The app reads the colors for you.
- Early warnings. It charts every test and tells you the day to act, before your fish feel it.
- Vacation plan. A trip checklist and a sitter card that puts feeding reminders on their phone.
- Family sharing. Up to 6 people. Everyone sees Fed by Mia, 8:02 AM.
- Unlimited tanks. Each with its own coach and reminders.
Ask the Fish Expert PRO
Knows: Living Room, 20 gal, 8 neon tetras, 6 corys, last test 3 days ago
My neons look pale and keep hiding. What's wrong?
Example answer
Simple pricing
Free
$0
- New Tank Coach and Water Doctor
- Will they get along and Pet Store Mode
- Sick Fish Helper
- Feeding and water change reminders
- 180 fact checked fish
- 3 free tries of the Pro AI tools each month
Most helpful
Pro
$4.99/month
or $29.99 a year, about $2.50 a month. 7 days free.
- Ask the Fish Expert, as much as you need
- Photo Health Check
- Test strip camera
- Early warnings and water charts
- Vacation plan with a sitter card
- Family sharing for up to 6
- Unlimited tanks
Pro is bought through Google Play and renews until you cancel in Google Play. Cancel during the 7 free days and you pay nothing.
Fish care sheets
Tank size, temperature, group size and the tank mates that get along, for 180 fish.
Neon Tetra
Betta (Male)
Guppy
Bronze Corydoras
Angelfish
Ocellaris Clownfish
Cherry BarbQuestions
How long before I can put fish in a new tank?
Most new tanks take 4 to 6 weeks to grow the good bacteria that clean fish waste. CheckMyFishTank's New Tank Coach reads your water tests and tells you when ammonia and nitrite both stay at 0 and nitrate shows up, which means the tank is ready.
What do ammonia, nitrite and nitrate mean?
Ammonia comes from fish waste and food and burns fish gills. Good bacteria turn it into nitrite, which is also harmful, then into nitrate, which is far safer and leaves with water changes. In a tank with fish, ammonia and nitrite should read 0 and nitrate should stay at 20 or lower.
How do I know if two fish will get along?
Search both fish in the app. It checks water type, temperature, pH, adult size, who eats whom, fin nipping, temperament, group size and tank size, then gives one answer: Great match, Risky or Do not mix, with the reasons in plain words.
Is CheckMyFishTank free?
Yes. The free plan covers one tank with the New Tank Coach, Water Doctor, tank mate checker, Pet Store Mode, Sick Fish Helper and reminders, plus 3 free tries of the Pro AI tools each month. Pro is $4.99 a month or $29.99 a year with 7 days free, and adds Ask the Fish Expert, Photo Health Check, a test strip camera, early warnings, a vacation plan, family sharing and unlimited tanks.
What does the Fish Expert know about my tank?
Your tank size, your fish, your last water tests and your recent care, like your last water change. So it can say your nitrate is 40 and your last change was 12 days ago, instead of giving generic advice.
Do I need an account?
No. Everything works on your phone without signing in. Signing in with Google is optional and adds a backup, getting your tanks back on a new phone, and family sharing.
Where does the fish information come from?
Every one of our 180 freshwater and saltwater fish was checked against at least two trusted fish care sources, such as Seriously Fish and LiveAquaria. When sources disagree we use the safer number, like the bigger tank. Each care sheet lists its sources.
When is the app available?
CheckMyFishTank for Android is in testing now and coming soon to Google Play. Join the early access list and we will email you when it is ready.
Get early access
CheckMyFishTank for Android is in testing now. Leave your email and we'll send your invite, plus a note the day it's on Google Play.
One email when your invite is ready and one at launch. No spam, unsubscribe any time.