There are a few cleaner shrimps such as the Skarlet Cleaner Shrimp, The Blood Red Fire Cleaner Shrimp etc.

There are some fish that will eat these shrimps no matter what such as the Flame Hawk and other Hawk fish, Lunar Wrasse and other Wrasse fish.

Make sure the tank that you are putting the cleaner shrimp in does not contain any fish that will harm it before placing it then place the shrimp over a rock where he can go for shelter.