All invertebrates in freshwater aquariums (crayfish, shrimps, snails) need minerals to grow. Crustaceans regularly shed their skin shell because it does not grow. This moulting process is a very strenuous, dangerous time for the animals, as it leaves them unprotected and vulnerable. The clay mineral montmorillonite contained in JBL Nano-Crusta has been proven to be extremely helpful in shell formation. Particularly in soft water, crayfish and snails need the addition of minerals to the water, as this water contains hardly any minerals. Snails do not shed their shell, but they also need a certain mineral content in the water to grow it.JBL Nano Crusta+ for invertebrates in freshwater aquariums: for initial setup and water changes for shrimps and dwarf crayfish+ provides the crustaceans & snails with minerals needed for moulting/shell formation+ the clay mineral montmorillonite inside helps support the moulting processes, especially in soft water+ vibrant colouring: promotes clear colour