Imagine Gold Llc AIM78075 Bio Power Filter with Skimmer, 75gal Imagine Bio Pwr Fltr W/Skmmr 75gal Removes organic film and dust from the water surface. Delivers oxygen rich surface water to the filter which enhances the growth. of nitrifying bacteria. Imagine Bio Power Filter W/Skimmer 75gal Removes organic film and dust from the water surface Delivers oxygen rich surface water to the filter which enhances the growth. of nitrifying bacteria Imagine Bio Power Filter W/Skimmer 75gal Removes organic film and dust from the water surface