I introduced 4 margarita snails and 1 cleaner shrimp 2 days ago. 3 of the snails and the shrimp have all been social little guys moving around exploring the tank. I haven't seen the other snail at all. At what point should I start searching for him? I have seen a tiny baby snail that showed up the night I put snails in. How detrimental is a dead if that is the case?