Looks like ammonia burn from shipping. What size tank do you have him in now? I would leave him in the current tank if you can- less stress than moving into a new one. Definitely try earthworms. Start with small, cut pieces.
He was in a 220, but I did go ahead and move him to the stock tank. The Geos were eating everything I tossed in, so he wasn't moving fast enough to get any of it. I made sure temps were exact, etc. I think it was as stressless as moving could be. I had a very large net, let him swim into it and then already had a rubbermaid tub with tank water in it, moved him immediately into it while still in the net, then dumped the water into the stock tank and let him swim out of the net on his own.
I do think he ate half of an earthworm so far, but now that he is alone I am going to cut them into much smaller pieces, as the half of an earthworm he ate took him a while and he was clearly struggling with it. Going to keep trying to feed him, this will make it easier during the process of getting him healed back up, parasite free and aggressively eating I think. Once he is healed up, fat and can get his own food I will move him back. Also, I can do more frequent water changes with the stock tank as it has a drain on the bottom and will be much easier.
As for dosing, thanks for the recommendations, I will see what others think as well. Also, do you guys still think I should start treating with Prazi or get him eating good first? I am not sure how much stress the Prazi treatments will put on him.
Thanks again