While it does not sound right, I've had more fish that look bad at first, and then ended up doing great, than I have seem good and then die. As long as you acclimated it correctly, and the lights are off. He should be ok. (as long as you parameters are ok) Shut off all the lights around the tank. Including bright lights in the room. I don't know much about the eel you have (aggressiveness) but as long as its not major aggressive, your wrasse should be ok.