All my fish are dead, within 2 weeks! Help!

[Mthomas22m]

I have a 10gal tank with guppies(had 4)
It is a fully cycled tank

Bought new fish July 7th x2
Fish 1 died 7/14 had clear tail
Fish 2 died 7/15 or 7/16
Fish 3 died 7/18
Last fish died 7/23

Water levels were fine the whole time
Ammonia 0, nitrate 5, niRITE 0

Fish 2-3 had no signs of illness at time of death, tails were fine etc

Started feeding baby shrimp(pictured below) fed that maybe 2 times in this time frame
Except with the last fish I fed it 7/22 to test run to see if that’s what is killing them. Now he is dead
Has anyone else had issues with tetra baby shrimp killing their fish??

Or did the new fish(7/7 x2) bring something with them? I’m at a loss

Any advice is welcomed.

 

[Mii]

if you bought new fish without quarantining thm that's the most likely problem.

 

[Laken]

I have to agree with what the other person said, it was probably the introduction of the two new fish that caused the deaths; they probably did bring something with them.

I even googled the baby shrimp product and read reviews on multiple sites and didn't come across anyone with a similar problem of it killing their fish/making fish ill. So my money is on the newbies.