Amysue -
I'm new to Bettas, but after reading lots of posts on the board ( & going a bit nuts in the lps) Here;'s what I found out.
My daughter's each have a betta in their room & I think the mini bow 2.5 is a perfect home for 1 betta. (It comes with a divider, but I can't bring myself to put 2 bettas in it with the filter running. The filter does take up quite a bit of room.)
The whisper filter that comes with it is perfect. It doesn't have hardly any current at all & it perfect for bedside because it's not too loud.
Our other 2 tanks have ugf & we've had some current issues with them & had to get valves for the bubblers to turn down the current. Bettas aren't into it & it stresses them out (according to other members. Mine all like a bit of current, but hated it when the thing was running at full tilt). (There are other members who keep lots of bettas in bowls with no filters & just do the water changes.)
They also really seem to like a soft plant to lie down on (think real or silk not plastic so it doesn't hurt their fins). Mine also like a hiding place in the tank(one of my fish likes hiding in Spongebob's legs!)
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Oh, and they better not really be like potato chips...can't have just one.
Ahhh... maybe I'm not the person to ask about that. I wanted 1 betta. I have 3 presently (& who knows how many I'll end up with if I can find the room! )
There are sooo many pretty colors out there (& different types too...)
Good luck - Hope this helped a bit!
Jenn