Are they peaceful? Can you put them with fairy wrasses?Hum. Once person's idea of "unique" could be another person's idea of common. I enjoyed keeping the little brackish water flounders at one time. They were cool to watch eat, easy to care for, and lived for many years in my tanks. In the salty world of 35 ppm, I would have to say the hardest fish to get to eat was my Copperband Butterfly, though I would not say it is any harder to 'keep' than most other butterfly fish once eating well. As for unique marine fish, I'll have to say my Pacific Redstripe Hogfish (Bodianus sepiacaudus). When I had this fish years ago it was a fish that pulled the eye to it immediately with its active behavior and bright red stripes. I miss this fish and have often thought about getting another one, but the destination tank for the fish is already fully stocked. Maybe someday down the road...