a pond filter and sponge filter,thats it,and no uv either.That is what you were wondering,right?
[video=youtube;0GkXQDfA0gU]http://www.youtube.com/watch?v=0GkXQDfA0gU[/video]

[video=youtube;0GkXQDfA0gU]http://www.youtube.com/watch?v=0GkXQDfA0gU[/video]