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Volkslid

Small Black worms in filter wool ???

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What the?? Have been running a sump on my six footer for 12mnths now & change the filter

wool that sits in the splash tray above the bio balls every month. The last 2 times I have removed it I have found these little black (appear to be worms) in the matting of the wool. Is this normal or is there something wrong with the tank??

all help appreciated.

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