Posted: Tue Dec 18, 2007 2:07 pm
The most important media is the mechanical media (the filtration pads at the bottom) and the biomedia (Rena's rings or stars or biomedia for other filters if it fits).
Carbon is nice (especially in smaller tanks), but you don't absolutely have to use it. Some people just load up on the biomedia and place extra where the carbon would go.
"You become responsible, forever, for what you have tamed." -Antoine de Saint Exupery-