re: Methane found to fuel rare glass sponge reefs
"Interesting, of course, I had a brief thought about Titan, but these organisms on Earth seem to still need water/H2O as a vehicle along with that Methane. Of course, it's a benefit to the sponges. :}"
Yes, I thought something similar, but I also think this life needs oxygen [not sure]. Water is fairly abundant in this solar system [and/or Universe] but having enough non oxided oxygen is not likely unless life is constantly creating it.
It seems to me for complex life to be in Titan or say Europa there needs to be a living organism that can make oxygen without sunlight.