Posted: Sat Apr 15, 2006 1:20 pm
I have a Fluval 4+ internal filter (currently sitting in a box). Are you sure this is the filter you have and not a canister? If you do have a 4+ internal filter (not a 404 or whatever), when you open the portion that holds the media (you pull it out of the case and open it up), the sponges (you use two of them) are closest to the water, and the carbon insert is sandwiched in between them. I don't understand how you could put the carbon on the bottom or on top of the sponges near the motor housing with the internal 4+ Series...
What size tank are you using the filter in?
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-