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Fish dying every night


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I have a 13 gallon tank that recently had some algae problems, and has a lot of hermit crabs. Every time I wake up for the past 3 days, there is one fish dead, that is swarmed with hermit crabs. The water is in good condition. 

What could be killing my fish?


Water conditions:

ammonia: 0

phosphate : 0 

magnesium: 1350

kH: 7


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