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Old 03-04-2009, 08:27 PM   #1
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Sudden and Massive die-off

When I got home late last night I checked on my frag tank. Everything looked normal. I come home today from work and almost all of the SPS corals have massive white sections. It's as if the tissue has just disappeared!

All water parameters, temperature, and salinity seem to at typical levels. This is a tank that has been doing quite well for weeks. The mushrooms and zoas still seem to be doing just fine.

Not really anything to do at this point except to try and understand what happened.

Has anybody ever had such an experience?
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Old 03-04-2009, 08:43 PM   #2
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What kind of Frags or Coral are in your Frag Tank?
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Old 03-04-2009, 09:06 PM   #3
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The corals that seem to be affected are acros and digitata. The mushroom, blastos, and zoas seem to look just fine.

That is pretty much all I have in that tank.

I'll post some pics here in a bit.
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Old 03-04-2009, 09:19 PM   #4
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Most of the time massive die-offs are due to some water parameter off target (valve left open, over dosing, etc) or toxicity from an outside chemical agent. How is the temperature?
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Old 03-04-2009, 10:13 PM   #5
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That's the strange thing. This is a transition tank of sorts. I have corals in this tank but do not dose anything. Water temp is 79.9. This is on a lab spec thermometer, not the cheap coralview ones.
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Old 03-04-2009, 10:15 PM   #6
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Transition tank, could the sudden change in lighting cause this?
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Old 03-04-2009, 10:34 PM   #7
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Maybe a Change in the Bulbs?
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Old 03-04-2009, 10:49 PM   #8
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These corals have been in this tank for weeks. Take a look at the pics and you will see how the problem is on one side of some of the corals but not the other side. Not sure the light would do that.







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Old 03-04-2009, 10:52 PM   #9
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You would have to make a major bulb switch to cause such a die-off imo, but if the water parameters are different than that of your main display and you recently transferred some frags?... Did you transfer any soft corals over recently that slimed up? More than likely one coral was affected by something and set off the others because of the waste/decay generated. I take it water changes were frequent? Sorry to hear about this...
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Old 03-04-2009, 10:55 PM   #10
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Is this what Rapid Tissue Necrosis would look like?

Can that spread to a whole tank like this?
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