Using the Aqueon ProFlex BioMedia Accessory Pack, turn the ProFlex into a traditional wet/dry trickle filter. Great for use in freshwater and fish-only saltwater applications to provide advanced biological filtration for a heavy fish load. Includes filter media and tray, a trickle-down grid, and bioballs (approximately 200). For use with the Aqueon ProFlex Sump - Model 1.