It sounds like your clownfish have "clownfish disease". I've encountered this a few years ago where the slime on their body almost starts to "melt". You must have introduced another fish that was carrying the disease.
I would let the tank go fallow for a good six weeks to rid of all the diseases. I'm not too sure how long a clownfish disease can stay dormant in a tank, but you should cater for that as well.
|