Okay, I put this heater in Algernon's tank yesterday afternoon. I thought for sure he'd be done exploring it, but a majority of his day has been spent doing this: 016.jpg
And if he's not laying across his hammock staring at the heater then he's swimming somewhere else around it staring at it.
My male either positions himself in almost an upside down position between the heater and the wall, and he'll stay there for quite a while. It's one of the many things he does that scares me half to death because I think he's dead. I'm starting to get used to it because he does this multiple times a day, but the first time I saw it, I panicked.