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I've always thought of 'too much filtration' in two ways:

- having a large filter turned to low or very low flow on a small tank. I suspect that a filter is best designed to work at a mid to mid-high flow rate. When turned down mid-low to low it does not work as well - the flow through the media is not so well distributed.

- having a large filter on a small tank can lead to having a fast water flow which, in some instances might be useful and in others a disadvantage. Depending on what one puts in the cannister, it can still be OK.

I have a 2224 on a 20g high and it is perfectly right in terms of flow and filtration.

Andrew Cribb
 
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