Just came across your thread here on Sand Fleas/Mole crabs. I'm very curious about keeping some in my Nano to keep the sand bed churned up. I'm actually sitting on the beach in the Outer Banks as we speak. Just caught a bunch with the kids. There are tons of them, big and small. I would want to catch small ones maybe the size of my pinkey nail. I have dips that I use when I add new fish I would definitely dip them in before adding. What do you think?