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
Tetra FilterBox Tetra EasyCrystal 600
Tetra EasyCrystal FilterBox 600: Tetra
Tetra EX600 Plus Complete External Filter Set
Tetra External Filter Tap 400-600-700-800 /400plus-600plus-800plus 4004218167261 | eBay