Hi try a product called "purigen",instead of carbon.Purigen is a polymer exchange resin beaded product in a micro mesh bag that can go anywhere were there is water flow it absorbs contaminants at a rate of over 500% more efficiently than carbon and unlike carbon it can't release contaminants back into the tank when full.The product is off white and turns chocolate colour when exhausted and the first thing you will see is improved clarity and it also removes organics just like a skimmer that is pretty useful in nano tanks.Works in freshwater and can be regenerated and saltwater too.(available from all good lfs doing seachem proucts incl ours)



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