swimming

My Oscar randomly starts swimming around as fast as he can in the middle of the night, enough to make enough noise to wake me up from my sleep, it last about ~30 seconds or so, is this normal behavior for oscars? He’s done it about 3-4 times in the past couple of months

A short clip of my biggest retic swimming around. She is pushing 12 inches. I can't wait to see what she maxes out at.