Thanks Jerry for your help, shame it doesn't tell me how to kill them!
Thanks zeb-pleco-fxu, very frustrating isn't it?
I only get to see them when I do a water change, when I disturb things, so I don't think I have many but I don't know how many live in my filter?
You say you are running bb so I may not gain from doing this, I suppose even if I clean & sterilise the tank, they will still be in the water & in the filter & the only way is to swap filters from another tank that isn't infected, but then I will need a spare filter & may still not get rid of them!
I have read even bleach doesn't kill them, so they must be tough little buggers, I suppose zebra tanks are ideal for them as they don't like sunlight, I will keep on doing more water changes & won't be defeated, it must be the Yorkshire water!
