It depends on how big your tank is.
The bigger the fishtank, the bigger the fish will grow.
Not only does it matter how big your tank/pond is but it also depends greatly on what the fish is fed, the variety of the fish, and the fishes genetics. Many goldfish can grow over a foot long- here is a list of standard sizes to expect a goldfish to grow:
pond goldfish like comets, shubunkins, and wakins can grow well over 12inches
fancier varieties like ranchus,lionhead,and orandas can grow over 10 inches
other fancy varieties like ryukins,black moors, fantails, etc. can grow over 6-7 inches
The largest goldfish recorded is over 16 inches
By feeding your goldfish a varied diet, giving them plenty of room to grow, and by buying goldfish from only a healthy stock you can ensure that your goldfish will grow to a healthy and favorable size.
Goldfish may grow to a maximum length of 23 inches (59 cm) and a maximum weight of 9.9 pounds (4.5 kg), although this is rare; most individual goldfish grow to under half this size. In optimal conditions, goldfish may live more than 40 years[2]; however, most household goldfish generally only live six to eight years.
Common Goldfish can reach a size over a foot, depending on the size of the aquarium.
The water should be at room temperature.
Well the best thing to do first, when they have outgrown their little tanks, you should get those big tanks with filters. You should get a big one because it would give your goldfish a lot more room to swim.
For twenty small (1-1.5 inch) Goldfish you should have something like a 30 gallon aquarium.
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.
trout pellets, they make the goldfish grow larger, faster, just a couple a day
No it will not. It will be runted by the lack of room. In order for goldfish to grow to full size they should be housed in ponds or very large aquaria.
Goldfish do not get pregnant. They are egg layers.
no
who cares? I think they will eat them because i once had two little guppies and the next morning they were gone. Answer- Yes, they will eat them. If they don't the guppies will die, because the stuff on the goldfish is like a poison for other fish. You should only put goldfish with goldfish.
contrary to popular belief, most goldfish do not have a stomach!
Small or Big it should be kept in a huge tank with Filter and Oxygen 10 gallons per Goldfish At least
I have a 10gallon with a common and a shubunkin goldfish. They are both around 2.5 inches. I am soon upgrading to a 30 gallon so there will be enough room when they get bigger.