Quote: Looks like it, but I don;t know--I got 4 out and there are quite a few more in there. Now how did these things find there way in there, a 20 gallon aquarium in my guest bathroom. I have never, ever seen a caterpillar or insect like this in my house. OMG!
It's a larval form of something. I know, duh! But keep some in a jar with the same thing they've been eating and see what the morph into. Just for grins and future meal worms. They are also good chicken protein. : )
The expert Gallo de Cielo weighed in and solved it--he's dead on. He said they get in there from the shipment.
They are beetle larvae from the family Dermestidae. It would be hard to know what species they are from the pics and how much of a threat they are to the Tenebrio. Some species are pretty bad to deal with and others are supposedly benign enough to put into a mealworm colony to clean the mess. I would think they'd be in direct competition with the mealworms and would get rid of them. You could either pull out all the dermestids or all the mealworms, depending on what the stages are and which would be easiest. If you try to just remove the dermestids, be vigilant over the next month to find any new larvae.