INNOVATOR: I can see using the aquaclear to hide things like a heater tube or to add a carbon bag, even a bit of circulation, but you dont want any mechanical filtration in a reef tank at all. particles being trapped keeps valuable food source from the main tank and acts as an ammonia/nitrite magnet at the same time which is BAD. Also adding a bag of carbon in there may have the same detrimental(mechanical filtration) effect on a small tank. If you are looking for something small then look to a small skimmer, it will provide all you are looking for without the negatives added in.
So I think that the Aquaclear is a complete waste regardless. Because using a proper protein skimmer you can get all the same benefits minus the detractors. A protein skimmer will add circulation, can hide heater tubes, and can even house a small carbon bag. Why waste money on an aquaclear when you can put that money towards a skimmer?? Complete waste. SKBok has the right idea, he uses something that actual performs foam fractioning(not very good but it still has a benefit with no downside)for his tank. Stay away from the Aquaclear IMO. If you cant afford a good skimmer, then get a skilter at least, follow what SKBoK did.