I put in a bout five crabs, five snails little snails, and three big snails. The crabs are all good. The little snails are suppose to be in the bed of tank but are hanging on to the side when not looking for food. And the three big ones have barely moved from where they landed upon entry to tank. We put them in last night. SOOOOO question. Is this normal? Will they (the snails) come around and start to do as they were in the store? Am I doing something wrong? Any advice or insight would be welcome. I asked about buying a shrimp they told me to wait n the only one they had was twenty five bucks so I didnt not get one.