If it was bigger than a blenny, you probably were seeing a Mother Sailfin Dragonet. Ours was mislabled and mixed in with scooter blennies at the LFS
, the one difference being that they are harder to feed. We bought him because we had a huge over-population of 'pods
, but he wiped them out in like 3-4 days! We have him eating live brine shrimp now, but he wouldn't take them until he was really hungry. Now we are trying to switch him to frozen krill but he's not taking that yet.
They prefer a deep sand bed for sifting and burying themselves completely at night.