Thanks for the detailed description with the pictures. Very interesting!
I'm really interested in how you converted the Eheim liquidoser to be able to mount it on a glass edge of the tank/sump (if that *is* what I'm seeing?).
I've always wanted to use the Eheim liquidoser (and feeder) on tanks but they are not made to be mounted on the edge of a tank.
Can you describe what that piece you attached to the Eheim is?