What is this?

[John1982]

And oh my goodness, why is he peeing so much?? I'm cleaning the newspaper in his tub 2-3 times a day, it seems like as soon as I change it he sprays everywhere again.

Urates and/or she's getting interested in attracting a mate. It kind of looks like a tub when one of my females is feeling especially randy - they'll even wag their tail to help smear it all over the place. This might explain the frequency too. Every time you clean it up, she feels the need to lay down a fresh dose of male attractant.