Sounds like ich, maybe when the fish has it the growth grows on their fins until it completes its cycle i think its like 1-1.5 months then it falls off into the sand bed and releases more into the water column. I believe this is how it is spread from fish to fish.
If it is ich however it could be brought on due to stress, and outbreak and changing water quality in your tank.
Just my 2 cents. There are way more people with more experience with me on this site though.
If it is Ich it wouldn't have came in on an invert as If I remember correctly they cannot host/carry it.
Or........... I can be completely wrong - A Picture would definetly help alot.
Yes black spots (burn marks) are quite normal on clown fish.
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