Howdy everyone. My partner and I live about 2.5hours south of Sydney. We are relatively new to marine aquariums and have had ours running now for about 7 weeks. We live very close to the coast so set up our tank by collecting 160L of sea water - that was fun! It has live rock in it, two chromis fish, one bicolour angel, one sea-cucumber, a piece of brain coral, some other coral (not sure what) and some coral sand. I have a Jebo 180 protein skimmer and am not sure if I have set it up correctly. Should the air injection control be closed right up or open? I tried reading the instructions but gave up (they should be called destructions!).

Hoping someone can help me. Thanks.