I'm curious about this too...I have an Aqueon Deluxe Kit w/ their 10 filter, and it seems
very strong for this size...lots of current even when filled to the brim, the danios love fighting against it, but I doubt a betta would ? I want to move them to a 20G and put a male betta in the 10.
My 10gallon was the tetra kit that they have had all over my town. It was really good, all i had to do was buy a heater and decor. The only thing was the current was really strong so i had to make a 'current stoper'