About: http://webisa.webdatacommons.org/369090399

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	He mentioned that you could put additional media between the foam filter and the tank glass if you want - media of your choice including gravel, bio balls, etc.
http://www.w3.org/ns/prov#wasQuotedFrom	plantedtank.net