Sump, refugnam?

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TheNamelessPoet

Aquarium Advice Freak
Joined
Jan 5, 2009
Messages
497
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CT
what are they and why do people have them.. I know what a sump pump itself is but cant nderstand their usefullness with a fishtank?
 
ah did not realize that. can this be moved then.... still currious what they are for tho
 
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