How much activated carbon?

aceguitar1

Member
Hello,
I have a JBJ NanoCube 12 gallon, and I just changed out the carbon for the first time. The package I got said to put in 1/2 a cub of activated carbon per 10 gallons, so I did half a cub and then some, but when I removed the old carbon, the bag that came with the original tank had much more than half a cup. Should I go back and add more to my bag? Is there a point where too much activated carbon can be harmful? Or too little?
 
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