Anthias with lock jaw???

[skinz78]

I just acclimated some new fish into my tank and when I added them from the drip bucket the Lyretail Anthia's locked it's jaw wide open and kind of went limp for a min or two, like it had a stroke or something. Now 10 min later it is sitting under a rock kind of normally but it's jaw is still locked wide open. The lights are off and no fish are bothering it.

Has anyone seen this behavior before?

 

[skinz78]

Well the fish is almost back to normal, it is hiding under a rock but is threatening to come out every now and then.