If one mandarin died in a 120 gallon tank I doubt it would cause a big spike, especially if you have a good cleanup crew in there. I would keep monitoring the water, though.
Did you have the mandarin very long? I had one die on me - for no good reason - about a week after I got him from a fish store. He was still fat so I know he did not starve to death. I think they are very delicate fish.
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28 Gallon Saltwater Reef Aquarium
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