Long story short, I now had one guppy in a 5 gallon tank. He looked less active about one week ago. Then about 2 days ago he stopped eating. Then he just laid around with zero energy although his gills were moving. Then yesterday he looked really bad and I saw him dragging himself along the tank a little. I was sad and didn’t want to see him die.

Then something weird happened. I walked away and came back about 5 minutes later and he was gone. I have completely cleaned out his tank (slowly in hopes of finding him) and checked all around his tank and he is gone.

What the heck happened??

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    please post the readings of your water test Ammonia-Nitrite-Ph,for how long have your tank been running? – trond hansen Jan 20 '20 at 6:11
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    are there other fish in the tank or any other creatures? Also check the filter – user6796 Jan 21 '20 at 3:20
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    I don’t have water test results to share. Not sure why that’s relevant. My guppy was dying of natural causes I believe. He was 3+ years old. – Melissa Jan 21 '20 at 5:21
  • Nothing else was living in the tank but him. He’s not in the filter. – Melissa Jan 21 '20 at 5:23
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    @Melissa me asking about the water parameters are relevant information i need to have to help you find the cause for your fish dying.and as you probably know a fish do not magically teleport to an other dimention when it pass away so it have to be there somewere in your tank. – trond hansen Jan 21 '20 at 6:50

Your water parameters will have everything to do with it. Your guppy was a few yrs old not an old age pensioner. When was the last time you did a water change? Fish tend to go and hide somewhere to die when they are not in good shape. I'm betting it was ammonia or nitrate poisoning.

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