You might want to post this question to www.nano-reef.com. They would be better versed to answer a nano question.

I would agree with everyone here that setting up a skimmer is a good idea but I don't think it is nessecary. I have been running a 20g for a couple of months now and it is doing great. No skimmer, no refugium. I am keeping a close eye on it though, a small fluctuation could be catasrophic.

KEEP UP WITH YOUR WATER CHANGES!

Enjoy,
Dave