I have a juvenile Ornate Polypterus, approx. 3 inches, which was housed for the past three months in a 29 gallon by itself. It ate very aggressively and was otherwise very active. I noticed about 10 days ago that it was lethargic and refusing food. I even tempted it with meal worms and live Ghost Shrimp, aside from its regular Krill, (it will not eat meat pellets thus far). I had the water tested and the Ammonia and Nitrite levels were perfect, as well as the PH. The Nitrates, however, tested at 80ppml. Put De-Nitrate in the filter, Prime, emergency water changes every 2-3 days of 1/4 of the tank's volume. The Nitrates are holding at 80ppml. I then tested my tap water and it tested close to 20ppml. The head guy at my fish store, who is also an eel keeper, both fresh and salt, recommended getting the Polypterus into a hospital tank ASAP. I drained my 10 gallon hospital tank, and refilled it with filtered water from the aquarium store, let it run and heat up to temp for awhile and then tested the Nitrates. It tested at 20ppml, so I immediately started acclimating the eel in a bucket with an airline tubing drip for quite awhile before putting him in. He is responsive and seems fine, not breathing heavily or anything, but still won't eat after 16 hours of being in the tank. I am very worried that it is simply going to starve itself to death. Any advice on how to get this little guy to eat, what I can tempt him with, how long these fish can go without eating, would be GREATLY appreciated. I have longtime experience in keeping these fish, and have never had an issue like this. In fact, I have a large one in a 72 gallon that is quite healthy. Please help!!!