Guest Lala Posted December 3, 2006 Share Posted December 3, 2006 Hey guys, I need to know how often the filters in my goldfish tank need to be changed. I've got some subtrate filters in one tank and the standard jewul green,black and blue one in another. Awaiting some replies LaLa Link to comment Share on other sites More sharing options...
Regular Member viscosity2004 Posted December 3, 2006 Regular Member Share Posted December 3, 2006 I'd refrain from changing any type of filter media unless it poses a danger to the fish. I'm not really familiar with substrate filters, so I hope someone helps you with that soon. Link to comment Share on other sites More sharing options...
Regular Member fishieperson321 Posted December 4, 2006 Regular Member Share Posted December 4, 2006 By substrate filter, do you mean an undergravel filter? Link to comment Share on other sites More sharing options...
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