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So my reef has a protein skimmer and tons of surface agitation and I'm confident my fish have lots of o2 but my small aio tank is very minimal and I'm questioning o2 levels. It doesn't have a skimmer or much surface agitation (it does have a little ripple). Actually it just runs on a few pieces of LIVE rock, and then in the aio back part I have a bunch of LIVE rock rubble and a folded up piece of filter floss. The 2 damsels and giant hermit seem fine but I'm just wondering if I should add some o2?