strange tang disease

[lahos]

I work at a pet store, and we have a 7000 gallon saltwater pond. Recently we had to drain all of the water out of the pond to re-enforce the glass windows. All of the fish seem to be doing very well except for the tangs.

One of our pacific sailfin tangs (zebrasoma veliferum) has very large bubbles of something just under the skin, it resembles the pop-eye disease, except the 'boils' are located on the body and fins. My co-workers and I have never seen anything like this before. I'll try to get pictures soon. If anyone knows anything about this please respond.

Thanks