Just yesterday, my live rock finished cycling and now I am looking to add a cleaning crew. I purchased four blue leg hermit crabs for my tank (6g nano cube) and they are like an army cleaning up my live rock. However, I would like to purchase a few Nassarius Snails to move around my sand bed (approximately 2.5 inches), but the owner of a local pet store keeps telling me that my hermit crabs will kill any snails for the shells is this true? Am I stuck to choosing either hermit crabs or snails? Is there anything to help them co-exist peacefully?