i had three little damsels less than an inch, the ones that the LFS sell real cheap, any ways i kept trying to add clowns to the tank and all the clowns kept dieing on me, i went through 5 clowns, finally took all the rock out to catch the
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, returned them to the LFS bought 2 more clowns and still have them to this day, the LFS told me the damsels dart at the fish and hit them with there heads rupturing the fishs swim bladder killing them. never had any problem's after i got rid of them, hard to believe that a small fish like that could be so much trouble