Fish aquarium water monitoring

I would like to monitor the water quality of a fish aquarium to make sure the fish stays alive:

  1. What do I need to monitor (oxygen level...) ?
  2. Which (low cost) sensor can do the job ?

Hello johnnule
Take a view to get some ideas:

https://www.ijser.org/researchpaper/Arduino-based-Fish-Monitoring-System.pdf#:~:text=GSM-based%20fish%20monitoring%20system%20using%20IOT%20explains%20about,will%20indicate%20the%20signal%20through%20buzzer%20and%20LED.

Have a nice day and enjoy coding in C++.

Oxygen (if you have a water pump to circulate the water) should not be an issue for the fish. Overfeeding is usually what kills them :slight_smile: