hi, does anyone use any of these products? i was thinking of getting some of each as i have 2 Ex1200 filters ready for my new project however im unsure how much im going to need for a tank of over 300L (zeolite = 1kg, 2kg?) (Purigen = 100ml, 250?) i plan on putting one lot say zeolite in filter one, and purigen in filter two. also im unsure as to where they go, i believe zeolite goes with the other bio media such as the ceramic stuff? (am i correct?) and the purigen near the top. (above or below the filter floss?) any help is supreme.