I too have a Seaclone skimmer. Although mine didn't pull anything out of the tank for a few days. After it "breaks in", it started pulling all kinds of gunk out.
Not sure why yours is pulling stuff out so quickly. Almost sounds like it is pulling an additive out that may have been added to the tank. Have you added any meds or any other kinds of chemicals to the tank recently?
Of course, you may have a lot of DOC
in the tank from the cycle and that is what is making it go crazy.