Basically, it's what I had laying around. Seachem matrix, foam from a decommissioned sponge filter, and some scrubbies I tore apart (thinking they'd make a good media for water flowing through the air pocket). The scrubbies seem to work to an extent since I find waste built up when I clean them. I'm thinking of replacing them with the bio-balls you'd find in a wet/dry with the idea they'll provide more surface area for bacterial growth, since they'll be packed tighter.
Last edited by le0p; 01-31-2013 at 06:02 PM..
Reason: Actualoly forgot what media was in there, until I looked again :)