There are many causes of stress in an aquarium environment. Most often this takes place when you first introduce a new fish into you tank. The usual result is a lack of appetite, which can be deadly. Lack of on-going, consistent nourishment can quickly lead to disease or other health problems. First Flake has been carefully formulated to satisfy all of the needs of both fresh and saltwater tropical fish and offers the added benefit of super charged attractibility. This comes in the form of fresh marine fat, and lots of it. First Flake should always the very FIRST food you feed a fish that is new to your aquarium or a fish that is stressed in any way. It is also excellent as a growth food as well as a once-a-day treat food.