LOL...
it took 2 people with 2 big net, and a pair of chopstick, slowly remove all the rock out of tank, carefully remove all the reef out the tank. at the meanwhile, not to emotionally disturb all other fishes. (like it's possible
) to catch him!!!
after caught the aggressive damsel, then slowly putting everything back to it's place. and lived with panic fished and cloudy water for one day. I guess if you don't mind to spent 4 hours doing it and live with cloudy tank for one day. Everything is possible. hahaha...
I am just determine not to have that damsel kill all my other fishes!
Otherwise, the other hurt one is always easy to catch since they do not swim fast if they are hurt.