This is a perfect filter for a small sized Betta fish tank

Although Betta fish are able to survive in jars or small bowls with nothing expect water this does not mean that it is right or ideal for your fish. Betta fish are just like other fish, except they have a labyrinth gland that enables them to have the ability to breath in oxygen from the surface of the water.

This does not mean that a fish tank filter is not necessary, because the filter plays an important role by cleaning the water and removing dangerous chemicals in the water that the fish release. Uneaten food can cause the growth of harmful bacteria and a filter will catch and decompose the uneaten food.

Fish tank filters also assist the fish keeper by reducing the amount of time and effort spent on cleaning the fish tank and other maintenance duties. Remember that even with a filtration system, you will still need to manually change the water in the tank with fresh water, on average do a 10-15% manual water change on a weekly basis.

The type of filter that you purchase will depend on the size of your fishes tank. Also be careful that you do not purchase a filter that is too strong or your fish will not be able to swim with a strong current in the water.

For small to medium fish tanks I recommend a small corner filter (the picture is placed to the left) that will perform the basic function of moving the water around as well as collect debris and clean the tanks water.

For more information regarding Betta fish and the best type of filter I recommend you visit the following link:
http://www.bettafishexpert.com/betta-secrets