Question about my fish?

Question

I have a 20 gallon fish tank and it has four guppy's, two otos, and two cardinal tetras.it had five guppys and three otos but they both died today. the seem fine earlier but now there dead. i have acouple a plants and a little log in there and nothing elses. i tested everything and everthing in the ph and other stuff is fine. i'm wondering what could have killed them.

Answer 1

Maybe they were sick or the heat has to much keep looking for things on your fish hat nay lead to a sickness that could have killed the other fish!

Or maybe they died because they attacked each other!!

Answer 2

Well ,probable that the temperature was not enough ,or  that  was  not too  good that style of life , or probable that for this reason they have died .

Answer 3

The might of been older fish, and just died..check your temp. make sure its correct to.