wallacevanpete

We inherited a pond when buying our house. Several of the fish have died lately and I am wondering if this is due to the hot weather lately or something else. The pond does have water lilies in it but does not have anything else apart from a lot of dead leaves and yuck stuff in the bottom. The water is very green at the moment. Not sure if the pond needs cleaning out or what. In the mornings the fish seem to be gulping for air at the surface but are ok later on. Can anyone help thanks