I just added a Scarlet Cleaner shrimp from the LFS for $19.
Yesterday I put my hand in the tank just above it and left it there for 3 or 4 minutes.
It slowly came up and then started picking at my cuticle (I had heard they do this, but never seen it). It tickled a little bit, but was very cool. It was only the second day I had him too.
He can also climb the glass and swim upside down across the surface of the water.
I am glad I added him to my tank, now I just need to train the fish to use his services.
The Blue-green Chromis learned how to ride the currents by watching the Perculas. I am hoping they will get the idea when they see him cleaning my fingers.
They are a bit small yet to though.
good luck with your CUC, I have been adding mine slowly. I now have 12 nasirius, 6 cerith, 10 scarlet hermits, 3 mexican turbos, and one zebra hermit, and 2 sand sifting stars in my 75 gallon.