When I had my old PC lights, I rarely saw them. Then when I upgraded to T5HO, they're out all the time. The Goby cruises around the bottom of the tank and the shrimp digs everywhere. They're not as active as my clowns but the symbiotic relationship that they have is far more interesting to watch!
For a fellow Nano owner (or anyone for that matter!) I would definitely recommend them.
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