Well, I don't have the little betta yet, but I bought the aquastart 320 for him today. It's got an under gravel filter which I'm guessing it will be fine for a male betta. I'm also contemplating some tank mates, but I know i need to be very selective for this. I'm sure that a good search will reap rewards, so thanks to everyone here who contributes so much information. Any advice on this setup will be greatly appreciated, this will be my first ever Betta.