Hawaiian Feather Duster, Help Please

[Archer917]

Had to move my Hawaiian feather duster to a new location in my tank he was no longer attached to anything from his case. Put him in his new home which has a little less flow than his previous one, and a little more protected there as well.
After about a minute he put his crown out, then about 7 or 8 minutes later he started spewing long white stringy silky stuff from his center!
Please if you can tell me what this is and will it effect my fish, corals and will the feather duster be all right? His crown is still extended and waving just like normal and so far he is acting like nothing ever happened.

Thanks

[Grizz]

Sounds like you stressed it run some carbon to be safe.