I need help locating an impeller for a Tunze 9420.040 pump that resides internally to my iTech 200 internal skimmer.
Skimmers just don't work in FW get both of them running in SW and do the comparsion again.
I have an I-Tech 200 that I am setting up in my first aquarium build. How many inches of water should the skimmer sit in for the best performance?