Our Blenny "Elvis" loves to come play in front when we are near. No matter where I move, he moves with me. It's fun to watch the cleaner shrimp do it's job and even cleans inside his mouth. He has been known to brush by my fingers when straightening things in the aquarium. I swear he's trying to be petted.
Add: Some say they have troubles feeding other than algae sheets, but after Elvis ate up all the algae on the rocks, I started getting worried that he was gonna starve, but after trying different things, he decided he'd stick around with us and now eats ANYTHING I put in the tank....so herbivors by nature, they will adapt to eating other stuff. We've had him 7 months now and at first he stayed pretty much in and out of the rocks, but now he begs you to come play with him right up front.