About: http://webisa.webdatacommons.org/111761101

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	As for carbon most of the time it is not necessary, really the only time that I see it in being helpful is after you have added medication to the tank and are at the end of the treatment to help remove the medication.
http://www.w3.org/ns/prov#wasQuotedFrom	tropicalfishkeeping.com