Ok so I'm starting over on my fish tank I purchased from Craigslist and I have a canister filter with the 29 gallon tank. Don't know much about the canister but I think it goes top to bottom with water. My question is what do I put in the trays. It had a large sponge in the first tray at the top so in thinking of keeping it, and the second had carbon with the third tray having ammo lock. As this is the only filter on the tank, should I continue to use carbon in the second tray and possibly add ammo lock with it or some other thing(suggestions) with the carbon to free up the third tray. And then what could I put in the third tray? Also what exactly are the three stages of filtration, I know there's mechanical and bio but what do they consist of? I know that's a lot to ask but I'd definitely appreciate the help.
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