A very well written article!!!! Thanks for showing!

The CT that is near the bottom of the page is stunning!

Anyways. There are ways to slow the filter Here is a link: http://www.petfish.net/articles/Do-I...urrentkill.php

I think if you have a big enough tank then filtration is needed as you need to cycle the tank or else you would be putting your betta through a cycle every time you clean the tank. I think 5 gallons can go without a filter but I think it would be so much easier to use a filter with a tank 5 gallons and up Much less work for you. My bettas do fine in the divided ten gallon with the filter. I use the DIY current adjuster and my bettas do much better with the current. I also have more plants and a clay pot for the ebtta who is nearest the filter to be able to get away from what ever current might be bothering him