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ranjansanyal2008 said:
Is it really possible to grow denitrifying bacteria in canister filter for a Cichlid tank?
As in bacteria that convert nitrate to nitrogen? You can do it, but you would need media that is extremely porous to house the anaerobic bacteria and a very low flow rate at or below 50 gph. You need to create an environment in the canister with as little oxygen as possible.
 

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Not really as shown above. Something like a large surface area mattenfilter dividing a whole sump tank is the most easy way to ensure this is actually happening. Plants and algae scrubbers probably do as well or better though.
 
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