Are guppies killing my other fish?

[AT88]

I have a 10 gallon tank I have 5 male guppies and anytime I have put other fish in the tank within a day or two I find the new fish dead and half eaten. Is it my guppies killing the fish or something else wrong?

 

[mambee]

Unlikely. Test your water.

 

[Ashenwelt]

Remember guppies are very hardy fish. They can survive when most others will die. Check your water or taking a sample to a store to test.