Privacy policy

Last updated 2026-11-10.

This policy covers the Android app CheckMyFishTank: Aquarium Care by Harris Apps Studio LLC and the website checkmyfishtank.com. We keep it short and plain.

What stays on your phone

Your tanks, fish, photos, care log, water tests and settings are stored on your phone. You can use the whole app without an account. Photos never leave your phone unless you use Photo Health Check or the test strip reader, described below.

If you sign in with Google (optional)

Signing in is only needed for backup, moving to a new phone and family sharing. We then store your name and email address from Google and a backup of your tanks, fish, care log and settings, without photos. We never see your Google password.

Family sharing (optional)

If you start or join a family, the shared tank (name, size and fish, no photos), care entries like Fed or Water change, and the name you choose are shared with the people in your family, up to 6.

AI tools

Ask the Fish Expert, Photo Health Check and the test strip reader work through our server and an AI service (Google Gemini). When you use one, the app sends only what the answer needs: your question, the photo you took for it, and tank facts (the tank's name and size, your fish, your last water tests and recent care). They are used to write your answer. Our server does not keep them or use them for anything else.

To count the tries that come without Pro, the app also sends a random install code. It is not linked to your name or email. We keep that code with a monthly count.

Purchases

Pro is sold through Google Play. Google handles the payment. We never see your card details; Google tells the app whether Pro is active. When you use a Pro tool, the app sends its Google Play purchase code to our server, which asks Google if Pro is active. We keep a scrambled copy of that code and the date Pro ends, nothing else.

Reminders

Feeding, water change and test reminders are scheduled on your phone. They are not sent from our server.

Share and install counts

When you share the app, your share link carries a short random referral code. We count shares, installs that came from a share (through Google Play's install referrer) and whether a Google Play review prompt was shown. These counts are not linked to your name, email or tanks. They tell us which ways of sharing work.

Website

checkmyfishtank.com uses Microsoft Clarity to see how pages are used (clicks, scrolling) so we can improve them. If you join the early access list, we store your email to send your invite and a launch note.

What we never do

No ads. We never sell your information. We do not use it for anything but running the app.

Keeping and deleting

Account data is kept until you delete your account. Delete it any time in the app (Settings, then Delete my account) or see Delete account. Deleting removes your account, backup and family spot from our server. Uninstalling the app removes everything stored on your phone.

Children

The app is meant for people 13 and older and is not directed at children.

Contact

Email hello@checkmyfishtank.com.