I have 3 ACFs that are almost 2 months old. They always stay close to the bottom and only swim to the surface for air. It almost seems like something is wrong with their back claws. The toes look like they are scrunched together or something. It sometimes looks like they only have 4 toes. I'm concerned because they don't swim much at all, they are very inactive. I have 4 other frogs in a separate tank that don't act like them at all. they were all born at the same time but the other guys are twice their size and they swim around constantly and swim to the top for food right away. I think the other guys wait for the reptomin sticks to sink to the bottom before they eat them. Is there anything I can do? Is this normal?