mine only ate blodworms until 12"(ish), then he would only eat worms/nightcrawlers until around 18". Now he will only eat fresh shrimp, he eats 2 a day. If i buy cheap frozen shrimp he bites it and then spits it back out. Luckily I get fresh gulf shrimp at a cheaper price...so its actually cheaper in the long run than any other fish food. Basicy just keep trying new foods, but as long as you eel is eating you will be fine. And as far as growth rate, mine is still hitting a little over an inch a month @ 19-20"