Sudden Death?

BooBooFish

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May 20, 2004
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VA
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This morning I awoke to my firefish goby swimming funny (kinda jerky). He was fine last night. I scooped him out and got him in to my quarantine tank. He died a few hours later. He had no visible spots on his body and until this morning seemed perfectly healthy. So I tested my water ammonia 0 nitrites 0 nitrates 2.5 PH 8.2 salinity 1.024. He was in my 30 gallon with a Clarkie Clown and a baby Dwarf Lion. So any ideas on what would make him go down hill so fast? The other fish are fine.
 
It is a possibility that he was struck by the lion but they had been happily together for a few weeks. I have racked my brain and so far that is the only thing that makes sense.
 
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