I put a flake food on surface and then you have to wet it down. The worms will eat that in a couple hours. They won't eat it dry, but make sure not to put to much water in.
This is what I feed the worms which I feed to my rays.
Thanks. I'm looking into getting a ray but I'm pretty sure I'm going to need more than a 125 gal to have a ray and a Jardini. And someday when I get my camera working again I'll post some pics.