Not far but it is a different water company which is why I suspect that. Some of my snails have also kicked it so it might be copper in the supply. As I say, I'm just keeping on top of maintenance, the fish seem fine so I don't think it's a nitrate/nitrite/ammonia problem, though I haven't tested in a while.SteveUK said:Tank is looking lovely Shame about the losses but I guess it can't be helped :? Have you moved far? Is it a different water company etc?