Yep tangs are venomous, at least some are. I was surprised to learn this at SaltwaterU last year. Dr. Bill Light gave a great talk about toxins and venoms that reefkeepers and snorkellers/divers encounter, and what to do about them. He had a great list of stuff that divers and hobbyists should keep in their first aid kits, such as MSG for jellyfish stings and the like, and how hot water breaks down the venoms of lionfishes and such.
It amazes me how few hobbyists know about the dangers, or potential dangers of some of the creatures they keep. Of course *some* don't know the first thing about even the most benign of creatures so buying dangerous or potentially dangerous organisms should be a given, I guess. :roll:
Client of mine a few weeks ago bought a sea apple at another store (I don't carry them) and was shocked to learn it could have wiped out everything in his tank.
Just like I was surprised to learn about foxfaces, many people also don't know how toxic Zoanthids are. Their toxin, according to Dr. Light, is more potent than that of a Blue Ringed Octopus - however one doesn't usually get a "dose" of toxin that large from Zoanthids. Dr. Light showed a diagram of the molecular structure of the toxin and it's one of the most complex carbon molecules on the planet (how's that for a U.P.I. for ya?)
I've been sliced open by tangs more than once but never had more than a bad cut, no "afterburn". Had a dinner-plate-sized Atlantic Blue slash the entire palm of my hand open once -- that smarted. 8O That fish was too large for any net we had and I had to move it by hand from a bucket of saltwater to a bucket of fresh because it had flukes/trematodes (and it got better too!).
I've been stung by more bristleworms than I can count (as I'm sure most here have been), shards of live rock, anemone stings, and once while moving a tank for a client, I found out why Fire Coral gets its name 8O I knew it was there, was very careful but not careful enough and my little finger just touched it ever so gently... owwie. I have no idea where the customer purchased that coral but I have a healthy respect for it now
Back in the day back in Canada, the LFS I frequented took in some fishes while their keeper was away - one of them was a stonefish and the keeper had no idea of its being venomous... cripey - that would have been a fatal mistake...
Do what now?
Jenn