Originally Posted by ThomasG07
What are the drawbacks to using the carbon?
Not really ... at least there's no drastic negative. It's just unnecessary unless your looking to remove meds. If your dosing Ferts, you generally don't want Carbon as it could pull in the nutrients, in some cases.
Carbon gets "exhausted" relatively quickly and then just ends up becoming part of the Bio-filter. Anywhere from 2weeks to a month so Carbon really does need constant replacing to keep chemical filtration. Not really worth the hassle. Keep some on hand should you ever need to remove Meds.
A nasty problem that could happen is if you have a drastic enough pH swing, all those impurities the carbon pulled in could be released back into the water.
This could be a result of poor tank maintenance.
I wouldn't worry ... any pH swing that drastic'll kill your stock first
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