Assertion: eel's tank | /r/HasProperty | at least 30 gallons
Facets:
value: with a fine sand substrate
type: OTHER
Source sentences:
text: Yet it is advisable to keep them in a tank that is at least 30 gallons with a fine sand substrate for them to bury themselves in.
text: It is advisable to keep them in a tank that is at least 30 gallons.