[Gone Tidepoolin]

They have been together for 2 years both of them are quite large.
This morning when the lights came on the lionfishs tail is shredded.
What to do? Will it grow back? Do I quarantine him?
The other fish in the tank are:foxface, lunar wrasse, jewel damsel and 2 hawkfish. The clean up crew is:3 urchins, sand sifting star and a fighting conch.
I am only guessing the eel did the damage.