Does your reef need some help? Let us do the thinking for you! WWC is offering this invertebrate package that will help with the general cleanliness of your glass, rocks, and sand. For Aquariums up to 30 gallons: 5x Snails, 5x Hermit Crabs, and 2x Sand Movers. (Pack will include a mixture of Astrea and/or Margarita Snails, Blue and/or Red Leg Hermits and Nassarius and/or Cerith Snails)   For Aquariums up to 75 gallons: 15x Snails, 15x Hermit Crabs, and 5x Sand Movers.                           (Pack will include a mixture of Astrea, Trochus, and/or Margarita Snails, Blue and/or Red Leg Hermits and Nassarius, Cerith, and/or Tiger Conch Snails.)  Our inverts are for saltwater aquariums only. All invertebrates have an arrive alive guarantee. WWC reserves the right to make suitable and equivalent substitutions depending upon our current stock. Due to variations within species, your item may not look identical to items in the image. *Please note that we cannot consider requests for substitutions on any of our invert packs and we also cannot guarantee the crabs contained within the pack will have both claws. They will have at least one and will grow back the missing one upon their next molt.*