A red exclamation mark next to a device in Mobius or a "BLE Disconnected" message indicates that your device is currently disconnected from the Mobius app. This is an easy issue to resolve and you can do so by following the steps below.
- Power on all Mobius controlled devices
- Enable Bluetooth and Location Services in your Device Settings
- Ensure you are within Bluetooth range of your aquarium
- Open the Mobius app
- Unplug the disconnected device(s) from power
- After 30 seconds reconnect your device(s) to power
- Refresh the Mobius app