I have a 2.5 gallon tank with a female betta in it in my daughters room. Right now I have an old filter rated for "up to 10 gallons", and the current is too strong for her. I'd like to just run a small sponge filter in it, but I need a quiet pump because it's next to my daughters bed. I wouldn't mind an Azoo palm filter but I don't want to buy it if that current is too strong. Any suggestions?