Tetratec EasyCrystal Box 300 od 20,25 € - Heureka.sk
Tetra EasyCrystal Filter Pack 600C 174665 Filter Cartridge with Active Carbon : Amazon.co.uk: Pet Supplies
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