So far it's not skimmed as much as I expected it to. The skimmer was purchased second hand so there should not have been a lengthy wearing in period. Skimmer was washed with vinegar and hot water and run for several days in used tank water prior to installation in sump.
I have tuned it to manual specs provided by Aquac.
The skimmer has only been able to produce light green skimate of wet consistency. The tank is a 4ft x 14' x 18' holding approximately 150litres excluding rock displacement. Bioload consists of 2 ocellaris, scopas, lawnmower blennie, green chromis, 2 x yellow chromis and a CBS. Mixed reef tank with softies and a few acro species.