sera Crabs Natural is the staple food consisting of carefully manufactured loops for all crustaceans in fresh and marine water. The balanced composition with natural ingredients such as Spirulina and alder cones provides everything the crustaceans require for healthy growth and safe skin shedding. Fertility splendid coloration and disease resistance are strengthened in a directed way. The sinking loops remain stable very long so the shrimps according to their natural feeding habits can grab them carry them away and eat in a hideaway without polluting the water.