whats the nicest blenny

I don't know of any blennies that will work in a 5g tank honestly. What about a goby?
 
tailspot blenny would be ok for a while in there, maybe longer if it was the only fish. Better off with a goby, tons of small gobies that can do fine in 5 gallon.
 
One of my all time favorite fish is the tailspot. See my avatar. That said, how about a neon goby. This is also a great fish, especially if you can get them as a pair. I love the pair I got a few months ago. Great personality and very tight pair bond. They are constantly together. They would be great in a small nano. The tailspot, not so great in that size tank. They are best in an environment where they can graze all day long on lots of live rock.
 
I'd go with clown gobies or any other cool micro type gobies.liveaquaria has a whole section for fish that will work in that size of tank.

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As others have said, even the smallest blenny will be a little big for your tank. That said, I'll second the blue combtooth blenny. I have one, ton of personality and spunk. I had a tailspot in one of my reefs, another great fish. Disappeared one day though. :(

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+1 on barnacle blenny. Very small, but will hide in barnacles unless there's food floating around. They look funny when they're feeding!
 
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