So one of my Betta's, Yoshi, is a.... fairly aggressive fish, he flares easily at everything. But that's pretty normal, what I'm worried about is how at night or his personal bedtime when he's on the tank ground sleeping. Okay sure, that's where he usually likes to sleep.... Then I glance over and he-- out of the blue-- darts to the surface of the water then right back down like some kinda predator is on his anal fin. Or he'll dart like a madfish from one end of the tank to the other and then up to the surface and then pretend nothing happened... is this normal?
My other betta have their own personalities but have never darted or anything unless something spooks them. I'm a new betta owner, should I be worried about Yoshi?