I recently purchased a used Fx5 and thought I had it completed but after looking at the users manual I see foam along the outside of all the baskets. I have been searching online to purchase them but cannot seem to find them? Does anyone know the exact name? Also I want to know if my media is setup properly? Mind you I'm just using the Fx5 for filtration. On the top basket I have Eheim Substrat, and on the bottom two I have the Fluval pre filter media. Sorry I'm quite new to cannister filters, Thanks in advance.