i have had my longnose hawk for about a year. i also have 1 cleaner shrimp and 2 peppermint shrimp. and he doesnt bother them, most likely because they are too big. when i first added the peppermints, there were 3, and i made the fatal mistakes of a) not feeding the tank before introducing new tankmates and b) not shutting the lights off. the third, and smallest peppermint shrimp was grabbed by the longnose before it ever touched ground. the other two are a happy mated pair, many months later.