I bought a cleaner shrimp last night in hopes it would help with any ich in my tank, however I seem to have picked a lazy one . The shrimp doesn't seem to want to clean the fish. With about an hour of releasing him last night, one of my chromis came up and waited to be cleaned but nothing happened. My wife watched different fish all day come up and sit there right in front but no action. I bought a smaller shrimp so not to frighten the fish. A couple years ago I had a shrimp that would jump on my hand and pick away. No such luck so far. Any suggestions????