11-08-2009, 04:43 PM
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Basically, you need added biological capacity, and that means adding something with more media which creates more room for the beneficial bacteria to grow.
There are several ways to achieve this...many people run multiple filters, sometimes two identical filters (I ran a matched pair of Emperor 400's for many years), other times two or more which are not identical. You often hear people run two different kinds of Eheim, or an Eheim and a Fluval, etc.
Since you already have a canister, you could add another and the combined media capacity would allow you to support a larger number of fish.
You could add a different kind of filter, like a HOB or my own favorite, a HydroSponge bubbling away somewhere in the tank (I actually use HydroSponges as my sole filters, with good results).