quarantine ftw! keep in mind, clowns are (as stated above) wild caught... so if you consider the trip they take from their nice little stream to your fish tank.... the catch, the bucket, the box, the plane/boat, the mail, the lfs, the community usually ill cared for tank - all the while being crammed into a space w/ too many other fish, while being under-fed with not so good water conditions... lots of clowns dont survive the first week in the lfs... those that do have come in contact with some perfect-for-creating-disease conditions, IMO...