As long as he doesn't get a lot of it on a frequent basis he should be just fine. Eco earth boasts that it's digestible, you just don't want them chowing down on it. I use eco earth as my topsoil in loki's enclosure, if you feed frozen/prekilled feed him on the center of a paper plate/piece of cardboard. It cuts down on substrate injestion a ton. I'm sure you could apply the same strategy if you feed live by placing the pray in a tupperware in his tank?