bairdimusprime
Bill
Put the fish in fresh water in a dark bucket or container and see if any white worms make their way out
Fish Dying off, no clue why
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Oceansize
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OP, are you using any metal fittings in your tank plumbing whatsoever? I wonder if heavy metals are a factor. I've been pretty lucky with disease so I don't have much experience diagnosing it, but it surprises me to hear of a disease that would affect so many different species all at once.
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Do not freeze!!!! Necropsies will not turn up parasites if they are all frozen. Keep in a small bag of tank water in the fridge and try to do asap!!!
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Take a look at it and see if there is any corrosion. I would replace with a plastic just to be sure. Also, make sure you did not drop anything in the sump. I have seen it happen. A tiny nail, screw, anything really.
Oceansize
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If it has any contact with the water, even splashes, I would replace it with plastic.
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Bummer. You can still defrost and look at the state of the gills and liver. I only saw one small area I would have been concerned about, but could have been just blemish. It happens. I always have to stop people from freezing them if they want me to look at them. 
Sorry I couldn't stop you. Off with the kids.
Sorry I couldn't stop you. Off with the kids.
Oceansize
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If it does turn out to be heavy metals, even after you replace the clamp, the water will still be contaminated. In addition to water changes, I hear that Boyd Polyfilters / Cuprisorb are good for removing them.
Oceansize
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And I totally agree with you; I had the same thought that dying corals should be the harbinger of heavy metals, not dying fish. I admit I'm stabbing at guesses at this point. I wouldn't have mentioned metals/toxins were it not for the fact that his nems are closed up and I just find it hard to believe that a disease would work this quickly across such a wide variety of species. Perhaps I'm naïve on that last point...
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Oceansize
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All stainless steel will eventually corrode, especially in salt water. I can't tell you how many stainless steel things I've taken scuba diving with me that have shown rust after only a few dives. Things designed to be used in salt water. In the diving world we avoid this by simply making sure we rinse our gear after every dive, but with aquaria of course we rarely get that opportunity.
There's a wide variety in the quality of stainless steel, but after time even the highest quality stuff can start to rust in SW. (IME)
Salty1962
Wrasse and SPS Lover
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Even Stainless has a certain amount of iron. Start using plastic clamps so you won't have an issue later down the road. If it's submersed then always use plastic. Even many tie wraps have metal tips, do look at that as well.
robert
Valuable Member
Water changes - carbon - poly filter? Not everything is a disease or parasite. Did the bugman come - did someone spray air freshener?
Sounds like a toxin - taking out those with the highest metabolism first. When in doubt - water change and carbon.
Sounds like a toxin - taking out those with the highest metabolism first. When in doubt - water change and carbon.
