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can i put carbon in my canister filter or will it take out ferts.
 

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I would say yes, no*. In that order.

You "can" but it in your filter. I wouldn't. It will initially pull out some of your micros but becomes saturated fairly quickly by other organic goblegook that adsorbs onto the surface.

Basically a waste of time and I wouldn't generally recommend it unless removing medications.

Was about to write up a whole thing saying why carbon doesn't actually work, but figured someone else has probably already done it.
http://www.cichlid-forum.com/articles/using_carbon.php

If its already in your filter though don't feel like you need to chuck it. Still has good surface area and works fine for bio media.
 
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