mabie its this ?
disease name :
callamanus worms
type :
nematode
description :
a red worm protruding from the fishes anus . several worms may protrude at the same time they move quickly back into the body cavity when the host fish is active .
they cause wasting away disease and white feces .
causes :
transfered from other infected fish . this worm will move from one fish to another,infesting an entire populatin .
recommended treatment :
fenbendazole - levamisole - ivermectin