NOTE: The water was at proper temperature. And we let them adjust first. But they started dying BEFORE we put them in our tank. So we put them in the tank and fed them a teeny bit. But it was too late.
So my dad bought some goldfishes(about 5 big ones and 20 small ones) today around 2:00 PM. And they slowly started dying about an hour later. And it is currently 12:30 AM and only 2 big ones remain. And they can barely swim. It's kind of sad to see them slowly, painfully drifting off into the next life.
But why?
Our tank is clean.
Our water is fine. (I think)
We have all the right equipment and stuff.
It is Petco. They shoved all the big ones in the same bag. Same with the little ones.
Plus, the fish already looked like they were in bad shape before we put them in the tank.
The fish looked as if they were sick and not fed properly. My dad is currently working on getting a refund for the fish.
The moral of the story: never buy from petco.