Thank you again for the information. I didn't have time yesterday to change the substrate, but this morning my tadpole was looking very lethargic and not eating. So, I thought about what could be wrong. I couldn't think of anything, then remembered that I was supposed to give him a mud substrate. It worked! He's looking much better now. He's eating, and he's moving around more than he has since I caught him. So, thank you very much.

I added a photo of the tadpole. Its not exactly top notch, but you can see the basics.

Oh, and I think that he should morph within the next week or two.

Sincerely,
Joh