Tank of death

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It's only one that went missing at this point. Right now I'm down to one guppy left. If he lives that means that he killed off my other guppys. None of my other fish seem affected by anything. They cory cats do seem to be breathing a little heavy but I'm not sure if it's me just being paranoid. I plan on doing a huge water change tonight (80% or so) and hoping that if it's something in the tank it dilutes it enough to save some fish. The biggest reason I don't think it's something in the tank is because so far only guppies have died (aside from the missing tetra) and all of my inverts seem fine.
 
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