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Peter,
I'm at home right now and don't have access to my records, but we still have some squampinnis that I acquired in 1998 from the Red Sea, and we have a Bartletts that is probably six years old. These are maximums though, the rest of these groups have died during the interim. We keep records on all our fish, but we handle the small ones as groups, not individually I.D.'d - so it does get a bit difficult tracking them sometimes.
Jubjub,
It is relatively common for invertebrates to serve as a mechanical disease vectors - although I can't tell you what might be the cause in this case. It is common practice for dealers to keep certain delicate fish in with their inverts (pinnatus batfish, seahorses, etc.) If they have an active infection, the water and mucus you move along with any inverts from that tank can carry the disease over.
Jay
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