firefish10
Fish Fanatic
- Joined
- Aug 11, 2008
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Why?
Why?

No. Your cousin is either A. going on pet store advice or B. going by old advice as I covered before (which are usually the same thing). It might help protect your fish from some contaminants in the water, but if you have these contaminants in your water in dangerous levels, your tank is either not properly cycled or not properly maintained.