Well, odd thing...
Like I said, he kept lying at the bottom on the breeding trap. What he would do is go by the edges of the net where the frames are and squirm up and under that.
Well, obviously I was worried he would get stuck or suffocate. He kept doing that, too. Lying sideways on the bottom while jamming himself under the frame.
So I remembered that my uncle also had a breeding trap made of plastic. No frames or anything for him to get stuck in. I put him in there and he seems to have perked up? He's not lying on the bottom as much anymore, and not lying sideways. Maybe he's just weird.