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#1
03-03-2014, 09:58 PM
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Sorry to hear about your trouble.
 Have you tested for stray voltage? How exactly are the corals dying? Sliming? Slowly receding? Quickly receding? Is the water or cloudy or has it been? I would be taking both biopellets and GFO offline until the tank settles down. I would continue to run carbon. Which brands to you switch from and to? 
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#2
03-03-2014, 10:10 PM
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FWIW I am sorry to hear this. I sympathize, there are so many frustrations in this hobby.
Apart from the above advice, I would also look to the Ca and Alk parameters in particular and have them double-checked with different test kits if possible. Are you dosing manually or using a calcium reactor? Do you use kalk? I might also be tempted to suspend any automatic dosing for the time being until things settle out. How new and how much gfo is there? In particular with "mysterious SPS death" PO4 plays a significant role (too much of it, too much change with it, and so on). Have you tested for PO4, and what was the value? And what test kit or tester are you using? If you had significant nitrate, I think you would see other symptoms, so I think we can rule out NO3, but it might still be worthwhile getting a trustworthy reading of that as well in the meantime even if only for ruling it out.
__________________
-- Tony My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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#3
03-03-2014, 11:49 PM
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That gas leak smell was likely hydrogen sulphide and probably what nuked your corals it doesn't take much
__________________
"Ever notice the last part of all the cool corals is pora" And you never hear anybody say "I spend all my money on Xenia " coincidence ????
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#4
03-04-2014, 12:14 AM
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Sounds like parameter swings wich new gfo will cause if adding too much. Gfo will greatly decrease your alk when freshly introduced. Happened to me recently and I lost most of my sps.
My issue was that my alk kit was reading 1.5 dkh too high and I thought I had it at 7.5 when really it was at 6 and then I introduced the gfo and it lowered it way more wich caused my corals to bleach. Ive also had similar issues when raising calcium too fast. Make sure your test kits are reading correctly and try to keep levels as stable as possible to prevent further damage.
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#5
03-04-2014, 12:58 AM
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I lost most of my tank when I was overdosing my Alk. It got above 8 and the SPS started to get burnt tips due to my bio pellet reactor, then it approached 10-11 and the LPS receeded and the SPS all died. Then I started to lose head after head of LPS. I really watch my Alk now.
Something else may have sent your Alk through the roof, but your Alk swing probably had a big impact in the death of your corals.
__________________
So many ideas, so little money!
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#8
03-04-2014, 02:27 PM
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Time to go old school and keep things simple as you try to get through this. Take the pellets off line completely. Run carbon and do plenty of water changes.
The ALK spike can definitely hit corals hard. Really watch your levels in the mean time. I would check for ammonia as well. When things rapidly die off nitrates and ammonia can spike. Only way to fix these levels are through large water changes.
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