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I've used both Eheim's bio media and Matrix. I know alot of people opt for lava rock and pot scrubbers, etc. but I'm a sucker for using these media because they are designed specifically for this type of application.

With the matrix especially, you can feel that the pieces are lightweight, which, I suspect indicates they are very porous. I'm using mine in an FX5 canister. Yes, it's more expensive, but it's a one-time setup cost and biofiltration is pretty important.

As far as choosing between Eheim or matrix, go for the cheapest. I don't imagine there's a major difference between the two.
 
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