does it seem greasy and very foul smelling? floating and greasy and foul smelling are signs of undigested fats. also its very hard to figure out what isnt properly digested when i dont know what it is you eat haha but anyways from only going off that pic i can only think maybe undigested fat. if youre having any symptoms or anything then you can let me know or ask me anymore questions. but its hard to go just off a picture alone.