Ick? Check the disease forum and compare what is on your fish with the pictures there.
Post a picture if you can. Are they young clowns? Because if they are more than likely they are crack addicts, i've read somewhere that juvenile clowns have a really bad drug habbit, and that you should probably check under some of your LR to ensure they aren't stashing things under there. Also start to lock you medicine cabinets - that is the new thing these kids are into now-adays, taking your prescription medicines. Watchout, nextime you wakeup and look at your tank you may find some arthritus
[hr]
floating in the tank.