I have a skunk cleaner and a peppermint in my 75. The skunk tends to hang out on the back of my rock pile but will come around to the front from time to time. (The back of the rock pile is just where he settled in. He's not really shy IMO.) The peppermint stays under the rocks unless it's feeding time or I have my hand in the tank.
I also have a coral banded in my 37 which cruises around mostly behind the rockwork unless it's feeding time or the lights are out. If you 'd like to have other varieties of shrimp, avoid these as they may be aggressive to others. I've never tried myself, but I have read both ways from others. I have seen stories on occassion of them atttacking small fish.
All three of my shrimp will jump on my hand when it's in the tank. The coral banded is a little less likely to do so, but he will.
If you're looking for a shrimp that will be visible most of the time, a skunk cleaner is probably the way to go. All the rest can be pretty secretive.
