I used to keep them in a small mini reef aquarium.... They would gracefully wrap their tails around some living coral I had, awaiting live brine shrimp to come their way, then with lightning fast quickness they would snap their heads and eat the shrimp, they moved so fast and hard you could hear a pop in the water.... After a feeding some would do a graceful dance around the tank... Beautiful creatures that the Lord has created..... Naturally, I fell in love with this addition to my collection: