That's mostly a myth. You could keep him tip be out grew he tank but that probably won't take long. Some of the smaller wrasses work well. My friend has a six-line that was in his 14G biocube for 2 years and in his 20G tank for another year and it's doing great. Funny fish to watch.
A clown pair might be interesting in that biocube. Get some nice bright orange ones.
Check out the nanoreef fish suggestion thread. They have good ideas on what can do what size, etc. I tend to draw blanks when it comes to ideas for fish.
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