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WRGB II 60 light is strong for a 60x36x36cm low tech tank.
For a 122x50x30cm tank you can use WRGB II Slim 120 light.
Firmware update was interrupted?
Totally close the app My Chihiros from phone backend. Download an app nRF Connect to scan all the devices, take screenshots of all the devices it finds on Scanner page.
A black part between the power adapter and the cable to the light.
When and where did you get the light?
What's the SN code on the bluetooth controller?