Does anyone know where to get substrate that would be dark enough? I have a male Cornuta that would be perfect, I caught him going darker the other day because of the Eco-earth but I definitely need something darker if he's gonna be able to make the full transformation, and after Bart's post I can help but want him to look exactly like that!
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A Pic of him more towards his normal color, taking a honey bath in a large cereal / salad bowl, and him trying to darken and blend into the eco earth, for comparison.
Clearly he still has a way to go. (he was a bit darker before i took away his log cover to take pictures to capture it haha)

Any help is much appreciated,
Thank you!

ps i apologize for the pic not being at the correct viewing angle, I uploaded it from my friends Mac, and Im more of a pc guy