The Nac-7 skimmer is rated up to 90g, pretty small for a 180g plus sump. I have a nac-7 running on my 34g cube/20g sump, a bit overkill but I figure if I ever upgrade to a 60g cube I'll be ok skimmer wise.
Also starting with mostly dry rock will take 6 months to over a year before becoming live rock. My advice is to stock the tank like you only have 20 pounds of rock in it or use mostly live rock and only a small amount of dry rock.
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One more fish should be ok?, right!!!  - Laurie
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