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Discussion Starter #1
Years ago i had a fluidised bed filter which hung on the side of my tank and apparently bolstered the biological filter in the tank due to its massive surface area of the sandy substrate.

My question is this, after a while the sand seemed to stop flowing and become sort of compact and more or less solid, does anyone else have this problem? or does anyone else know anything about these filters?...

Im asking because im considering buying one for a discus tank/amazonian tank.

Any advice would be very greatfully received!!!!!

Bill
 
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