Tetra TetraTec Easy Crystal Carbon and Filter Pack 250-300 EasyCrystal Media | eBay
Tetra EasyCrystal Filter Box 600
Rotor Tetra for internal filter Tetra easycrystal 300
Purigen - I am running a Tetra Easycrystal Filterbox 600 which came with my tank (unfortunately since it's freaking huge). I wanted to put some Purigen in there, but where do I