Sometimes the the need arises to remove certain fish from your saltwater aquarium. Perhaps they’re being a bully, taking bites out of coral, needing to be moved to a quarantine tank due to illness or are just getting too big for the tank.
In my case, when I bought my new Reefer XXL625, all the fish had a growth spurt. Going from a 80 gallon (300 litre) to a 133 gallon (550 litre), gave them more room to swim and therefore grow.
I had never had a problem with my wrasse living with the two fire shrimp and they did so happily for years. Suddenly she was big enough to nip the lower bodies off both shrimp while still alive. They did not survive so, unfortunately, she had to go.