shellyx said:Gorgeous!
Just a note, keep an eye on him and remove him quick if he dies. Nudibranchs usually eat a specific prey. The pyjama nudibranch usually eats a red sponge from what I could find. If he can't find food he will starve to death, usually within 2-3 weeks, and when he dies he will release toxins into your tank.
A very beautiful animal. I wish you the best of luck.
I google image black and orange nudibranch, came scross a couple websites that call it a pyjama nudibranch.
A dive company operating in the red sea area says you can see them eating a fire sponge or red sponge in the wild. (iirc)
Do you mind me asking how much you paid? Lol