looks like a regurge from here...but you'd know one if you smelled it; they will literally smell like death.
you need to figure out what caused the regurge. regurgitations are caused by: not enough heat, bad feeder, a spook!, or too much handling before digestion.
in the meantime, your immediate actions are: no offering food for 3 weeks, keep water fresh, triple-check husbandry for like a week (multiple times a day if possible), and observe.