Alright I've had my betta for 2 weeks and I've noticed that he is still glass surfing a lot. I have no idea how he acts when I'm not there but when I watch him, he is constantly zipping really fast along the front and sides of the tank. He's by himself in a 15 gallon. I don't know if this also happens with you guys and its just recognizing me, or maybe if somethings up and the current us too strong so he doesn't swim in the open. I noticed he does avoid the middle of the tank. I have my filter out put facing the back wall to try to reduce the current from flowing free across the tank.