Bettas know when they are being watched though. They are not stupid. I've had 4 of them and they knew when I entered the room, all of them looked at me everywhere I went.I'll watch him until around midnight to see if anything happens.
Btw the GPH of the AquaTech 5-15 Filter (Mine) is 105GPH.
I don't plan in doing this for a week or two because i still have some things to buy. I just wanted to confirm what i'll do.