Given warm water (60F) good food and plenty of room to grow and swim in, a goldfish can reach 3 inches+ in 12 months from hatching. In good conditions to go from 1" to 2" would be around 3 months.
Goldfish can vary in size, but on average they typically grow to be around 6-8 inches in length when fully mature. However, some breeds of goldfish can grow much larger, up to a foot or more in length.
Largest Goldfish ever found has a size of 19 inches. See the related links.
Depending on the size of the goldfish right now, it may take as little as 1 year to as long as 3 years for it to reach adult size.
Regardless of the type or size of goldfish the minimum acceptable size of an aquarium for a goldfish is 30 gallons. Buy a tank that is at least 30 gallons if you plan to have goldfish. You can comfortably fit 3 goldfish in a tank this size but no goldfish in a tank any smaller. Goldfish are essentially pond fish and need lots of space to swim; they will not thrive in a small 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.
No. A inch is as long as 2.54 centimeters end-to-end.
Goldfish commonly grow to over 12 inches. The size of your tank would indicate that it is not really large enough for keeping goldfish in. The basic rule of fishkeeping is "1 Inch of fish needs a minimum of 1 gallon of water. Goldfish should really be kept in a pond.
Yes, but your tank size needs to support it. If you mean that a regular goldfish is a long single-tail goldfish, then you need at least a 40 gallon tank just for the 2 fish due to the size potential of the common goldfish. If you mean a regular goldfish as in a round bodied fantail, or perhaps a ryukin, then you need at least a 30 gallon tank for the 2 fish.
5/16 inch by 1 inch long approx.5/16 inch by 1 inch long approx.
Its about average size.
They grow up to about one inch long.
Pikaia