Yea, that's why I haven't gone with them.Yes, I had true peppermints eat my hammers... BF wouldn't believe it and wasn't until one of the peppermints was well into muching 4th and caught in act that believed. At that point we removed them so two hammers survived (but can't say 'hammer garden' with only two). Don't know if all three peppermint shrimp were doing it (suspect not), but at least one peppermint was being very very very naughty