Actually, you DON'T need a skimmer on a set up of that size. I am sorry to burst your bubble Canuck, but as long as you are on top of your maintenance and do an appropriate sized water change weekly/biweekly then you can actually keep ahead of a skimmer. There is no need to put on a filter for a SW nano, due to the fact that your LIVE ROCK is your filtration, and so is the sand. Tho I do agree that to use the rock as your filtration you should have more rock unless you are not thinking of putting in the corals. You do however want to have a 19X turn over rate going through the rock mainly. The HOB would be decent if your looking to polish the water, I would add a little floss just to pull the fine particles out. But it may not be necessary.
