external skimmer

hello I am selling my HUGE regal 300 external skimmer. its was never used and I shut down my system so I don't need it. I am asking $700 pick up is in Edison NJ 08820 No shipping its too big wine bottle is to see how big this skimmer is last picture is of receipt from BRS

After being out of the hobby for ~20 years, I am setting up a new system and interested in running a Regal 200-EXT skimmer on my 168gal DT. With a sump like the Synergy SK-60 below, I am planning on using both the Refugium chamber and the internal skimmer chamber as “dual refugium” to get...

I have only ever had internal in sump skimmers before. There was an optimum height for placement in the sump. I have started a new tank with an external skimmer. How do I control the lowest level of the water in it? Do I control it with reference to the level of the water in the sump? For...