I think jaw fish are cute, but decided against one after I read that they require at least about 4 inches of a soft substrate, and tend to dig under your rocks and such. I love my bicolor blenny as he has a great personality and likes to stay in his favorite hole in the rock with his head always part way out to watch you and what ever else is going on. He also comes out and perches on the rocks, and will take all different kinds of food. Lesley