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Cute...just looks like he's taking a nap! If he was sick and wanted more warmth, he'd realize that the other end is the warm end.
My bettas loved to rest on the top suction cup on the heater. I used to have a Visitherm Deluxe glass heater. I changed to the Visitherm Stealth plastic heater. Those suction cups aren't designed quite like the Deluxe ones. My betta couldn't figure out how to rest on them. Wow, was he mad!