"Other Blennies are found hiding in crevices and caves at coral reefs."

I would say the midas fits in that category, not the other. Mine had a nice little hole that he disappeared in. I tried and tried to find him but he was no where in the tank. I took all of the rock out because I was adding another 60 lbs of sand. Where was he? Hiding in a rock. I saw him finally start to poke his head out about three days later. He must have been out of the water for about 15 minutes! Mine was never anyhere near the surface, unless it was dinner time.
HTH!