Probably, but usually the comet goldfish will get all the food and/or the other goldfish will become miserable. This has happened to me before and I do not recommend putting them in the same tanks. Try putting the fancy and comet godlfish seperate!
Assuming you are talking about comet goldfish, the fish should live for a few decades under proper care.
yes
One goldfish needs a 30-gallon tank, and an additional ten-gallons per additional goldfish. Goldfish can grow to be 10-12-inches long.
No. Goldfish are freshwater fish and tropical starfish are saltwater fish.
The only issue I've heard about concerning housing goldfish together is any big difference in body shape or size. Bigger goldfish might be more aggressive towards smaller goldfish. Also, the more streamlined breeds (koi, comet, etc.) might have an easier time snatching up food, leaving little behind for the pudgier, slower fish (fantail, ryukin, etc.).
Goldfish and cichlids have different care requirements and temperaments, so they may not live peacefully together in the same aquarium. It is generally not recommended to keep them together.
The best thing to do is ask the shopkeeper in the fish shop and find out first but goldfish go together with no problems if you are lucky because some goldfish can't live together. http://en.wikipedia.org/wiki/Goldfish
Comet fish, also known as calico fantail goldfish, typically live for about 10-15 years. With proper care and a healthy environment, they can sometimes live even longer than 15 years. Regular water quality maintenance, appropriate diet, and a spacious tank can help maximize their lifespan.
The fish must look relativity similar to get along in SOME cases. I suggest not mixing fish but if you must, orange/white fantails and veil tails can mix.
I have 2 myself. I've had them for about 1 year. I expect them to live maybe around 8-11 years. Or less if you don't take care of them enough.
The number of goldfish that can live together in a single tank depends on the size of the tank and the type of goldfish. In general, it is recommended to have 20 gallons of water per goldfish to ensure they have enough space to swim and thrive. It is best to research the specific needs of the type of goldfish you have and consult with a pet store or veterinarian for guidance on the appropriate number for your tank.
no turtles will eat any fish they can catch