<http://webisa.webdatacommons.org/37392485>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<arcatapet.com> .
<http://webisa.webdatacommons.org/37392485>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/prov/428101394>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/37392485> .
<http://webisa.webdatacommons.org/37392485>	<http://www.w3.org/ns/prov#value>	"In marine aquariums that contain invertebrates, especially stony corals, calcium must be maintained at proper levels for optimal animal health." .