What is this

[lighteningthes]

hanging from my fish. I don't know if it s poop or not, none of my other fish have had this, that I have seen. It looks like a string coming from its belly in front of the anal fin. Its a keyhole angel we got coming up on two weeks ago.

 

[alabama reefer]

Probably detritus(poop) my angel will have a string of it running out. ( I guess their poop cutter isn't as sharp as other fish)