got a huge box of free tank stuff. brand new fluval 304 canister in the box was in the bottom. never even plugged in. what a deal right? anyway. never had a canister before. im sure i can figure out the plumbing options with my book. but my questions are 1) how long will it take for the canister to "cycle" and build up enough bb i can take the hob off the tank and use it as the only filter. and 2) it has the filter inserts, then the three stackable basket inserts. my first one has two bags of carbon, should there be two or just one? second is empty. what goes here? and third is full of these white circle things. what are they and what do they do? anyone with experience with one of these i would appreciate your help alot! 
