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leaches

Subject: leaches
by marcel on 27/4/2014 21:40:15

Hi I am hoping I can get some advice,today I was cleaning my pond filter and notice a few, I think leaches in the filter along with loads of what lock like wood lice but slightly different . I would imagine these might be some type of lavia. But my concern is the leaches will thes if they are leaches pose a problem for my fish?
Any help will be appreciated.