The brighly colored Clown Goby - Gobiodon okinawae - will always be a great favorite of ours. It swims about, but also perches on hard or soft corals, mushrooms and LR. This petite yellow fish is a great addition to any tank. Ours lived for about 4 years before it died, but during those years, it evaded the jaws of a Lionfish for many days!! (Mysteriously, the lionfish vanished while I was out of town. Hmmm.) The Clown Goby is definitely Reef-safe.