I just acquired a 23'' black aro and its Annis seams to be protruding i didnt notice this ween i got her yesterday, i may have missed it anyone know what that means, if anything.
It's protruding anus (PA). Caused by infection in the intestine where food is not easily digested in there. Could be caused by anything you fed to the fish.
A dose of 0.3% epsom salt will work as a laxatives to clear the fish bowel. Try "meaty" diet for now till it heal.