About: http://webisa.webdatacommons.org/450459353

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	I am convinced that sand is a better substrate than gravel as sand causes uneaten food and detritus to collect on top rather than fall into the crevices of gravel.
http://www.w3.org/ns/prov#wasQuotedFrom	tropicalfishkeeping.com