Yes, size doesn't matter.
Golfish are at least 2 years old when they have there first bunch of eggs
Yes, as long as your tank is big enough for 3 goldfish. It should be at least 35 to 40 gallons in size even when your goldfish are babies.
It ranges. They generally grow their whole life. The oldest goldfish lived to be 49 and I believe it was about 3 feet....The house hold goldfish lives between 10-20 (20 means you did great!) years and get about a foot long. They seem small as babies but rapidly grow and need large tanks. Small tanks and bowls stunt their growth and causes many problems besides how big they get. So to answer your question, they get big.
Goldfish spawn in groups in springtime when the water temperature approaches 70F. They do not have live babies.
About the size of a small pin head.
It is generally not safe to put small goldfish with big ones in the same tank because the big ones may bully or even eat the smaller ones. It is recommended to keep goldfish of similar sizes together to ensure their safety and well-being.
For twenty small (1-1.5 inch) Goldfish you should have something like a 30 gallon aquarium.
Small or Big it should be kept in a huge tank with Filter and Oxygen 10 gallons per Goldfish At least
If the frog is small yes. If big the fish is likely to be eaten
1600
FRY.
no
If they are there, you definitely can.