Odd Death Of A Platy

[Bella]

Well, I went and fed them today. all was find and eating. two hour later I look over and my platy is dead. I did a test right away and Ammonia 0 Ph 6.8 to 6.7 Nitrite is 0 and nitrate is 10 ml/l.. I have no idea what happen to her. she looks like no marks on her.. doesn't look bloated or anything. very odd I have had her for only a year and she never showed any signs of sickness.

What you you think could have happened?

 

[angelkatelyn]

i'd say age as they only live up to 2 years, if u got it from a shop u dont no how old it was when u bought it, if it was a fry then i dont no, new to this