I might beg to differ on the skimmer. I've had a 5 gallon nano for 3 years skimmerless. I had one little clown fish a few snails and some coral. Our local fish store here has a 10 gallon nano absolutely FULL of coral in it. (This has been running for 5 plus years and looks gorgeous). The one this is that hang on back skimmers are kind of annoying and then to add noise to the general system that's more audible than say an in sump skimmer. If you keep it simple with lots of flow and regular monthly water changes you should be fine. You could probably even get rid of the fluval (or take all the media out and use it just for flow). Our local store with the nano still has the same fish and coral and my nano did really well (and I'll have to admit - I don't think I ever did a water change on my nano cause I didn't even own a hydrometer - shame on me) but I didn't kill anything. Just topped up evaporation every couple of days. This is just another opinion worth considering. Hope this helps.
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