Hey there! I have a 24" fire eel (Norbert

) who eats quite a bit, but 10-15 nightcrawlers sounds like way too much. I have access to two sizes of earthworms, including the Canadian nightcrawlers which can be a fair bit larger than the usual American night crawlers.The large ones can be easily up to 9" long when all limp and stretched out. He will often eat about 6+ nightcrawlers for a good meal depending upon their size. However, I don't feed every day. Usually, I feed about 4 -5 days a week, and my guys have been wonderfully healthy with amazing growth. FYI, I have seen him puke up a worm when it he gets too full, so if you do accidentally overfeed up it comes. I tried to make sure he looks nice and thick after he's eaten, but, too many worms, they start looking like lumpy sausages. I have a two smaller fire eels (well 18-19"), and one that is such a pig that I decided to put him on a slight diet. He kept stealing others' food, and I thought he was going to get a double chin. A fat eel looks terrible. Ill argue that first hand, and I like well feed fish.

Also, all three of them have different levels of willingness to take different types of food, but all of them flat refuse pellets. The two smaller ones, who I raised from 6" to 18" in about a year, will eat defrosted Hikari krill, chunks of steamed tilapia and cocktail shrimp. Norbert, the big older guy, is a little more picky and will only eat the steamed stuff but not real well. Pellets just have never been accepted at all.
Congratulations on your pick up! Of the countless species I have, these guys probably my favorite type of fish. They all hand feed, with Norbert being so spoiled that he ignores any food that hits the ground. Start calling your new guy when you go up to feed. I have Norbert trained so, that if for some crazy reason he isn't already there with his head sticking out of the water to greet me, he comes when I call his name.

Oh, yeah. If they ever get sick, I inject the worms with Gel Tek, and the worms just eat it up without any idea they just took their medication. Good luck!!!