Pond Filter Mature Media

sjolliff

Fish Addict
Joined
Jun 28, 2009
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Brighouse,West Yorkshire, UK
3 weeks ago i added about an 8" square bit of mature media from a friends pond, i took most of the bugs off
i had a problem with a few snails and think there called black worms, my tank is now empty now just water and sand,
still finding the odd snail but there harmful,

but iv removed about 6 35mm long red leeches and some babbies,
i know these can harm the fish,
is there anyway of killing them all off?
also think there goin to be all in my filter too
 

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