What is your favorite filter media and why?

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Hi eheim ehfisubstrate best biological media ever(y)
filter wool for 'polishing' the water:)
And sponge because of all the different porosity you can get it in and different sizes and you can cut it to size:)
Shrimps! not a media as such but they do an amazing job of keeping the tank clean:)
Merry Christmas:)
 
I just use the blue filter pad that you cut to size and the ceramic cut tubes. I have bio-wheels, so I don't worry too much about the media.
 
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