Porcupine Pufferfish damaged!

[NinjaEmperor]

hey guys just registered.

ive added a koran angel to my FOWLR tank 2 days ago.

today my puffer has three bite marks in his back and the skin is missing on about a third of his underbelly.

thankfully and remarkably hes still swimming about and looking reasonable chirpy, ive isolated him to give him a chance to heal.

the obvious potential culprits are the loran angel, niger triggerfish, and snowflake eel. the bites on his back look trigger size but im not sure which fish is more likely responsible.

any ideas?

logic dictates its the koran angel but ive seen little bite marks on him before i added him.

also have you any tips for helping the puffer recover?