2.5 gallons is better than a plastic cup, right?

Cloud seems to be happy in his small tank. After reading about some bettas declining after being moved to a bigger space, I’m worried about making the change for him.

He got a water change/tank clean last night and he decided to make his new bubble nest above the heater…he seems to like to rest perch there—is that safe? Should I move the heater cord where he can’t get behind it?