Fish only ponds can be placed in shaded areas of a garden, but if you want to keep plants they might have other requirements.  Fish Protector forms a unique insoluble, polymeric salt with heavy metals that is stable under conditions of both high and low pH. Building a pond with low quality pond food will result in the fish producing more waste and polluting the pond.  Now we are in the third week of training your fish, and I want you to throw in the fish pellet and have a cup of coffee or something.  Goldfish may display similar behaviors when responding to their reflections in a mirror.