how long were the dead fish in the tank to cause the spike in ammonia? If it was just a day then it was the ammonia that killed the fish not the other way around.
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Red Sea Reefer 525 XL, Vortec M1, Reef Octopus 150 SSS Elite, Apex, WAV power heads, 3 X Aqua Illumination 26 HD. 
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