My tank is right by my bed, so I can always see Bettasaurus out of the corner of my eye. He's in a 10 gallon tank with a pretty strong current that he LOVES. Anyway-I see this flash of red out of the corner of my eye & I look over and he's in the front corner of the tank where the current is semi strong. He's swimming down into the current & then flipping around really fast and letting the current streak him up to the water line. He's been doing this for probably about 5 minutes. Every now & then he'll go over to the heater or somewhere the current isn't as strong & rest, but then he's right back at it. He cracks me up.
I think he just retreated to his "bed" for the night.