IME, it's a simple training process. If it only eats live feeders, then feed dead feeders until it gets used to eating food that isn't alive. Step 2, take the dead food, marinate it with pellets. It will eat the dead food but accidentally pick up and spit out the pellets. You increase the ratio of pellets in your mix, so it won't starve and get too thin, will will be stay hungry. Eventually, through days or weeks of effort, it will swallow the pellets in the mix. Then you just feed pellets! My old NGT was only 4", but would only eat frozen bloodworms. So I marinated bloodworms with pellets, it worked after a few weeks. Just don't starve it, IMO. It also learns from other fish that are eating pellets. Good luck!