Support

Each cold start requires an internet connection to retrieve app configuration. Check Wi-Fi or mobile data and make sure the app is allowed to connect. Try another network if available. If other sites work but the app still cannot open, email us with the time of the issue and a screenshot. Avoid deleting the app as a troubleshooting step, because you could lose local records.

Enable Care notifications in the app and allow notifications for Clear Tank in iOS Settings. Check that the task is scheduled in the future and whether Focus or notification summary settings affect delivery. Completing a repeating task calculates the next date from the completion date and your chosen interval. Overdue tasks can be checked on the Today tab.

Review available camera or photo permissions in iOS Settings. Try another photo source or add the photo later. A photo-journal entry needs at least one photo and supports up to five. Do not delete the app to resolve a permission issue.

Go to Settings > Data & backup to export a full ZIP backup or original water-test values as CSV. To restore, select a ZIP created by this app. Restoration replaces the current tanks and records, so export your existing data first. CSV and PDF files are not full backups and cannot replace a ZIP for restoration. Backups include photos and notes and are not encrypted by the app; store them securely.

Clear Tank has no accounts or its own cloud sync. Export a full ZIP before switching phones, transfer it and restore it on the new device. System backups depend on your device settings and should not be treated as a verified app export. If you delete the app without a usable backup, we cannot retrieve your aquarium records from a server.

When ads are enabled and no unused reward is available, completing one rewarded ad unlocks one PDF for the selected tank and date range, or one cross-tank comparison session. Within that session you can change filters; leaving the comparison ends it. Closing an ad early or failing to load it does not grant a reward. A PDF reward is consumed when the file is successfully created, even if you then cancel sharing. Unused rewards remain available after a failed operation. When ads are disabled, these features are available directly.

Check your connection and try again later. Ad availability also depends on the advertising service. A reward requires the ad's completed reward event; you do not need to purchase anything or transfer money to a support contact. Records and everyday calculation tools remain available.

Create at least two tanks before opening cross-tank comparison. Select the relevant water-test metric and date range. A metric or period with no recorded readings will not show corresponding trend data.

Check test-kit instructions and units. The total-ammonia field is expressed as nitrogen; nitrite and nitrate use the mass of the corresponding ion. Estimate volume using internal dimensions and actual water depth, then account for substrate and decoration displacement. The water-change tool models theoretical mixing; the dose tool scales product-label quantities linearly. Neither provides treatment advice or a recommendation for a large water change.

Use Settings to select a language and a light, dark or system appearance. The app supports English, Simplified Chinese, Traditional Chinese, Japanese, Korean, Spanish, Brazilian Portuguese and German. When ads are enabled, open Ad privacy options to review applicable choices. System tracking permissions can be managed in iOS Settings.