Alright, So I guess this is my last update on Pete. I put off making this post because I wanted to be certain before posting. As far as I can tell, Pete isn't with us anymore.
I haven't seen him in about a month. Mostly I would see him in the morning 2 or 3 times a week and then it jumped to almost daily. Then, about a month ago, I didn't. And it's that simple. I haven't seen a body, living or otherwise. I do have a very efficient bristle worm (he only scavenges) and I believe he did his job. That, and the fact he's a dwarf in a 75 gallon tank, make me doubtful I will find evidence one way or another.
Pete was definitely some kind of dwarf, and I believe he was an O. digeuti, so it isn't surprising. I had him roughly 5 months (that I can confirm). He was young when I got him, so it stands to reason that finished off his life cycle.
It's just sad to have such an anti-climactic end to my little guy! Thanks to everyone who followed along!