well your clown will be dead at the current rate if you wait a week to get the peppermint shrimp out... Get a fish breeder net if you have to and contain the peppermint shrimp in that... you gotta have a walmart, *****, petsmart or something near you.
If you get desperate... make te peppermint shrimp walk the plant into the toilet... seriously though, you sure you got the right species of "peppermint shrimp?" There are a few... also make sure its not a camel shrimp as those can definitely be bad news.