Originally Posted by sealife
What is your old filter and what is your new filter?
Leave both filters running together for 1 month so the new filter can build up on bacteria.
Most here dont use black carbon. It gets used up in around a month (give or take) and will need replacing or it will leech everything back into tank.
Black carbon is best used to removed medicine and smells and impurities from tank.
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Agree with the filters- if you need to change the pad, put a new one in a month before you remove the old one. Honestly unless it's falling apart you shouldn't need to replace it.
The carbon though is not true, it does not release what it has absorbed back into the water. Correct though that it is used to remove impurities like tannins and for removing medications.