Any other type of goldfish will work. You could put them with Black Moors, Koi, Red Ryukin, and any other type of goldfish.
If you mean goldfish than you could comfortably put 2 goldfish in a 32 gallon tank.
No, one goldfish needs a 20 gallon tank to itself and nothing smaller. You could get a betta, but really it would be happier in at least 2.5 gallons.
Goldfish need plenty of room to swim around and get very large. In a 1000 gallon pond you could put 25-50 goldfish just keep in mind that goldfish grow very large and need about 20-30 gallons each when full grown.
You may want to add a liner to be on the safe side, but you could have 2 fancy goldfish, one one common or single tailed goldfish. (goldfish grow big and fast)
Wouldn't recommend putting a goldfish in a 5 gallon tank-regardless of what type or size of goldfish. This is because the goldfish would be stunted causing it to have an untimely death. The condition in which a goldfish is "stunted" is where the fish adjusts to its tiny environment so much as to stop growing. The fish will stop growing on the outside but will continue to grow on the inside. Goldfish are naturally messy and create a LOT of waste. This factor would cause the tanks water to be poluted which inturn could kill not only the goldfish but possible your mollies too :(. Two mollies is enough for a five gallon tank. If you truly want to get a goldfish you will have to house the goldfish in a 10-20 gallon tank with very good filtration
You could have a school of neon tetras (approx 6), or 1 fancy goldfish
It depends on the size of the tank. About one fish can fit into one gallon so if you have like a five gallon tank then about five fish could fit into there.
Goldfish are best with goldfish with the exception of weather (dojo) loaches, or bristlenose plecos.Goldfish need 20 gallons for the first fish, and 10 gallons each per additional goldfish (30 gallons for 2 goldfish). If you have a 40 gallon tank for example, you could have 2 goldfish, and 1 bristlenose pleco without being overstocked.
One goldfish needs 20 gallons of space, and then it's an additional 10 gallons each per goldfish after (at minimum), so two goldfish need 30 gallons of space.A one gallon tank is not very good for much of anything, but if you would like to keep a Betta fish, you could look at getting a 2.5 or even a 5 gallon tank.
Only if the "feeder Goldfish" - which is usually just a mutt bred Common/Comet Goldfish, is very small and the Telescope is an adult. If it fits in their mouth, that's where it will end up! However, "feeder" Goldfish have the potential to get over 10"-12" excluding tail fin, and a large one of these could very easily fatally injure a more fragile fancy Telescope Goldfish. The two varieties should never be mixed.
Tri Color Rex and Mini Rex COULD be called Calico I guess.