SO we hatched the Coral Banded shark below in our classroom touch tank, on November 8. 10 days ago. He had a yolk sack attached the size of my thumb. That has been absorbed and he is healthy looking. just a small half a bb size sack maybe smaller left hanging on. We are not sure when to try to feed him, LFS where we got the egg told us to not feed for 10 days after hatching but we are not sure he meant hatching with fully absorbed yolk sac or after sack is gone? What should we do?