Calcium is important in helping to maintain proper shell condition and health in turtles. Nutrafin basix Floating Turtle Gammarus Pellets contains gammarus shrimp which are a highly nutritious invertebrate that are a natural source of calcium. Nutrafin basix Floating Turtle Gammarus Pellets should be fed as a core diet. The easily digested floating food sticks are effortlessly consumed by turtles, helping to control their messy feeding habits. Turtles and terrapins should be fed a varied diet containing freeze-dried foods like Nutrafin basix Turtle Snack (freeze-dried Gammarus).