external skimmer

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...