We recently moved to an older property that has a largish pond - I've just looked out of the window and there are about a gazillion frogs and loads of frogspawn. Is this normal? Where will they go? I have visions of frogs appearing in my house. There were fish in the pond, but they haven't appeared recently (pond is about 1m deep) - and at least one has met its maker via a heron. Any top tips on how to manage ponds for a complete novice?!