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I started with 1 Guppy (Yellow) and it worked well for 3 weeks. Daughter asked for 1 more. So we got 1 more guppy (Orange). So now there are 2 guppies in the tank. Exactly after 2 weeks, the guppy that I got earlier (Yellow) died. The tank seemed to be fine.

So next week we went to the store and got another guppy (Blue). It was great the Blue & Orange we perfectly fine and they were playing. Exactly after 2-2.5 weeks, the Orange guppy (which was already there when I added Blue) died.

This was very strange because now I have lost both of my original (Yellow and Orange) guppies and I am worried, what is going on. So I think may be I am doing something wrong and decided to not get another fish for next 5 weeks. Interestingly the only guppy remaining now (Blue) continued to survive. It seemed alright. And I thought may be the previous two dead guppies (Yellow and Orange) were sick from the store or something.

So I let another couple of weeks pass by (now 7 weeks since the Blue one was alone) and decided to add another guppy to the tank (Black). Exactly after 2 weeks now, the Blue one is dead.

So every time I have added a guppy to the tank the existing guppy dies in 2 weeks. I am not sure what is going on. I feed them flakes once a day in the night.

Fish experts, please help me. I want to add more than one guppy to the tank but every time I add another guppy the previous one dies. Thank you in advance. Please help me solve this mystery.

Sample Fish Tank :