I finally got the filter I ordered in the mail today. The Azoo Palm Filter.
I've tried it out and immediately removed it because it obviously made the water move too much for my Betta. It is very slight water movement, but he struggles in it badly. It definately stressed or scared him, because now he's hiding behind one of his plants and not coming out to see me.
I'm trying to find a way to lessen the water movement. Testing it out in an empty tank now... I've put one of the spare filter sponges underneath where the water flows out. It seems to work well, but is this safe?
What sort of filter does everyone use for their betta? Maybe someone else had to put together something to lessen the water flow?