Okay, so I've had Hydra for a year now, and he's always had regular poops, but today this happened
and this came out of his vent
I think this is a seminal plug but they've never been this long or big? His tank is a 40 gallon breeder, he has a reptisun uvb light, and his lighting is a 100w exo terra bulb. His food he ate yesterday a salad of lettuce, carrots, and asparagus and some mealworms.
That does look like a seminal plug to me. It also looks like he has a bit of an upset stomach. It may be diet related. If it just happens a couple of times I wouldn't be too worried. If it continues for several days/weeks I would try adjusting his diet a bit and see if that has an effect. This is a good list to reference for some ideas about what to add to salads http://www.beautifuldragons.com/Nutrition.html