Thank you so much. I have general cure on the way for the eel. The angler was fed with forceps for the live and dead food and just ran away from everything which was a big surprise for me. The lion just had some white poop, would it be appropriate to treat him too even though he’s eating? Thanks!Two common reasons you don't see some species in captivity are; disease prone and/or feeding difficulties. With that eel I wouldn't be surprised if they don't commonly come in with internal parasites and/or have feeding difficulties. Offering appropriate live food is first, I have a rule, if my preds don't eat after 24 hrs, I immediately treat with general cure.
Anglers are pure ambush predators, so initial feeding can have some nuances. You must make sure the prey actually gets to a place where the angler can catch them, so ghosties are usually the easiest. You can use a clear feeding stick to herd the prey into a position where the angler can catch them. While anglers can eat items as large as themselves, a small one may be more intimidated to attempt a larger item, so make sure the prey is not too large. A healthy angler should be using your lure pretty quickly to attract food and moving around the tank to hunt for food.
All preds are usually starved so it really shouldn't take long for them to respond to live food if they are healthy.