phret-, phreto- +

(Greek: phreatia, a well, a reservoir, a tank; a cistern, a pit)

See this phreat- unit for other closely related word entries.

phreticolous (adjective), more phreticolous, most phreticolous
Organisms inhabiting tanks or containers.
phretobiology
The study of organisms in water tanks.
phretophile
Organisms thriving in water tanks.
phretophilous
In biology, characterized by thriving in water tanks.
phretophyte
A plant that lives in a water tank.