It's a possibility, but a goldfish and a platy should never be in the same tank as they are not compatible, and their needs are different
You should not have goldfish and platies in the same tank ever.
No because they are smaller than goldies and they might mistake them for food and accedentally eat them.
who on this earth would humanly kill a goldfish or any animal
No, if you put a pretzel in a goldfish's bowl, it will kill it
yes
You can only kill a goldfish once. The sentence suggests it is possible to kill it more than once.
yes, leaches kill gold fish
no
Don't feed it
yes, but it may kill the goldfish
Goldfish are not aggressive fish. They most definitely do not kill people.
Answer It is the platy's waste.