Getting my guys off worms was a necessity. I go through 25 large Canadian nightcrawlers 5 days a week now at $.25 a pop where I'm at, and they're still looking for more. They otherwise go through about a 1/2 lb of market shrimp before they're full satisfied. I cant imagine what they'll be able to put away when they're all full grown!
Your guy is at a size where he maybe be still fairly flexible. I would recommend at least two food sources or when he's full sized, you'll go through at least 25 worms 5 days a week easily. But, the biggest reason is if you have a shortage of something he's not totally gonna starve.