I have a 4 and a half foot tank which is well matured. I've recently been thinking about adding a fox face into the tank but am worried that the damsel may stress it out and possible end up killing it in the process. He does bully other fish, but they are used to it and usually have a go back and it ends there. I'm aware fox faces are placid but they have their venomous spines to protect them. Do you think they would use these spines to defend against the damsel if he decided to attack? I wouldn't like to add one if it was just going to kill it.