I have looked online on how to make sponge filters and I want to know from seasoned Betta owners what design works the best for adult and fry Betta?

Hey everybody! I have been looking around lately for a better filter, although mine still is awesome! here is what i have had for, gosh, years! http://www.petsmart.com/product/index.jsp?productId=2752295 I really want to make my tank more advanced, with a filter with even better properties...