What's wrong with that? When I first got mine I could barely see them they were so small.. now mine are pretty big as well... spawn babies every so often that get gobbled up but I don't think the life span on them is as long as a coral banded or cleaner.... my CBS is about 3+ years old and I've lost about half my peppermint shrimp in under 1 1/2 years (unless something ate them which I really doubt).