No, a Koi is a carp. It comes from the Japanese word Nishikigoi which literally means 'coloured carp'.
absolutely!
as far as i know yes,unless your fish is aggresive
No cos gold fish are cold water fish and star fish are sea water
Rule of thumb is to not mix tropical fish and goldfish.
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
Goldfish release growth-inhibiting hormones into the water they live in: the more goldfish in a smaller space, the less likely they are to grow. For instance, if I have a common goldfish in a 5 gallon tank, it will grow to about the same size if I had 6 of the same fish in a 30 gallon tank. But leave that fish alone in a 30 gallon tank, and it will grow larger. This is why pond goldfish grow bigger. But goldfish won't grow at all in seawater; they aren't saltwater fish.
Most! Maybe if you go to a pet shop and ask but mostly all fish can live with a goldfish in a tank
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.
No, Neon Tetras and Goldfish do not belong in the same tank. Goldfish prefer cold water, while Tetras are more of a tropical fish.
They will live to be happy and healthy fish just as long as you take care of them.
No! Salamanders can not live in a fish tank, they need to be in a glass enclosure with beathing ventaltion at the top, they also need a heat lamp.
My friend had hers in a mixed tank of platties and goldfish and such. They are lazy doccile fish mostly.
No, first of all they should not be in the same tank, and secondly, goldfish are egg laying fish so they do not get pregnant