humans
Yes
they often fall or have a disturbing chase
Predatory fish and birds will kill heaps in the wild but most goldfish are killed by people who don't look after them properly.
go to the vet ASAP
They've not got muscles to keep them up straight. Its only the water which is holding them up and making them move.
to cure these problems, you should go to your local pet shop, tell them about the problem and the will give you special treatment
Goldfish are cold water fish while the others are tropical, so no they won't as depending on what type of tank you put them in, one group will die.
The famous saying is "The enemy of my enemy is my friend."
You enemy has a friend, you consider that guy a enemy also so the enemy friend is a enemy
The Enemy of My Enemy has 397 pages.
The Enemy of My Enemy was created in 2006-04.
Enemy of the Enemy was created on 2003-02-03.