Basically that's all you would need. i mean some cleaning of your sump and sand here and there won't hurt anything, but you gotta remember you want your sump to be filthy. Protein skimmers are only really neccessary with reefs I've had my 210 with about 7 fish and have never had a protein skimmer and they all look beautiful and healthy. All my levels are perfect. Also I tend to keep my temperature a little higher i keep it at about 80-81 instead of 72-78 just because in my experience fish stay more colorful and more active.