72 gal. need advice on filter

[tinknocker1]

I have a 72 gal. tank with a small Arowana,Clown Knife,Parrot Fish,Striped Rapheal Catfish and a pleco.I have a Eheim 2217 canister filter which I bought used.My question is they show 2 different ways to set up this filter up, one with just different filter pads,the other with some subsrat and mech and pads.Which application should I use.:huh:

 

[Rbishop]

Welcome to AC! Start a thread in the General Freshwater Forum with your question...more folks will see it there and be able to advise.