User Manual: https://www.eheim.com/resources/product//94/downloads/11/EHEIM_airpump_100_200_400_manual.pdf
Author: TA Brothers review
Why do you need an air pump for such a beautiful planted tank?!
you have two sockets for the air hose. you hv shown only one placed into the tank – where is the second hose placed
in depth …….. but no talking ….. ok