Perhaps I should add more, but the confusion was fun.
Shrimp are opportunistic, and those quick claws can pull pods off rocks so fast that it will make your head spin. Shore shrimp eat off the rocks about as efficiently as cleanershrimp, they don't seem to be as fast to me. I have not seen one pod since I added 25 shore shrimp tomy tank (although I don't think I have nearly that many shor shrimp any more) I had tons of pods just the day before and the shrimp have been the only change.