TheMightyQueenPixie said:Be careful with filtering small tanks with bettas...The current is too strong for them and they will get tired and die....Small filters dont allow you to adjust the flow rate and are designed for max. aeration of the water...This constant high flow is what gets them.As always, I stand behind my bare bottomed, not filtered jars...A snap to clean and much easier to keep a healthy Betta in.
That's true..that's why i went with an undergravel filter - and the air flow in the uplift tubes is low...a lot of people don't realize that under gravel filters don't need a lot of air flow to work properly - mine is set low and the tank is crystal clear.