yes it looks kinda like a wormMy last Oscar had that right before he died... I am curious to know myself.... It kinda looks like a worm right?
white stringy poop (protozoans) it looks more like that then it does a critter thank you guppyFrom the pic I can't tell if it is white stringy poop (protozoans), or an actual critter (threadworm nematode) Either way feeding the fish with Jungle's antiparasite medicated food should cure it, no problem.