http://aqualandpetsplus.com/Amphibian, Caecilian Worms.htm These are Caecilian worms. There's a lot of different species most live on land yours (T. Natans) is 100% aquatic. I've had on for a couple years now, they are a lot of fun to watch. They are amphibians and breath air so you need a shallow tank. Ideally they should be able to reach the surface for air with out swimming. I suggest a 20 long tank filled half way up. Having the tank half filled also helps prevent escape! I feed mine once a week 2 to 3 night crawlers. They seem to locate the food by smell so I cut the night crawler in half. Even so they will be the last tank occupants to find the food. If you have catfish or fast moving fish your caecilian will never get food. Have a hiding place for them and your all set.
i have one they are awesome low maintence they are blind they get huge and one inch thick dont put them with slow fish or guppies or they will become lunch the guppies that is eat bloodworms shrimp pellets brine shrimp etc. check out this site it has lots of info www.aqualandpetsplus.com under amphibians