URGENT! Grapevine beetle setup: help!! I've never kept beetles and I need advice!!!

Hi everyone! Last night I was out looking for grapevine beetles and other buggies outside, as one does, and stumbled across what I thought was a dead grapevine beetle on my driveway. I was going to leave it there because the ants need to eat, but for some reason I decided to mess with it a little first. It moved! Since he was alive, I decided to save it since being eaten alive would be a bad way to go. He perked up as I carried him around and was ready to fly! But to both of our dismay, after multiple attempts it was clear something was wrong. He couldn't fly. I decided to keep him as a hospice pet situation and I want to keep him for the remainder of his life (or even better, rehabilitate him). My goal is to make him comfortable, not to breed him. His name is George. Any suggestions would be much appreciated!!!

I have him an a large mesh butterfly cage with Virginia creeper leaves. I plan to put a plastic tote box on the bottom for substrate. I have some coconut core I can use and I can get dirt from my yard but most of it's pretty sandy. I understand that rotting logs might be ideal, so I'll see what I can find.

-moisture: what???? How do I measure it and what does he need???
-substrate suggestions?
-other info i might need?

thank you!!!!!!
 

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This is a male, and all scarab beetles suck at flying, so your observation is not wrong. You can use any kind of soil including the coconut coir alone, or some sand mixed topsoil. Just grab the soil and see if you can feel moist. That is all he needs. These beetles feed on live plants. Find host plants nearby, like grapevine leaves.
 
This is a male, and all scarab beetles suck at flying, so your observation is not wrong. You can use any kind of soil including the coconut coir alone, or some sand mixed topsoil. Just grab the soil and see if you can feel moist. That is all he needs. These beetles feed on live plants. Find host plants nearby, like grapevine leaves.
Thank you!! If I pick fresh leaves for him do you think that will work or does he need the actual plant? Also, with the flying, he was able to take off but he wasn't able to fly far at all and he kept falling out of the air. I've seen other grapevine beetles fly pretty far and land somewhat intentionally, so that's why I was concerned (along with the fact that he was lying on concrete with ants). Do you think that there is actually something wrong with him or if he's okay??? His elytra also were never really completely closed. Just slightly open. Does that mean anything??
 
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