I got several acute bladder snails, so I could feed them to my fish after they have babies, but they keep laying the eggs above the water, and they are all drying out, is this supposed to happen? Did I get the snails that don't want to be parents? Are they supposed to lay them above or below the water? I had like 8 egg clusters, but they all dried up. I've had them a couple weeks, but no eggs have hatched.