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
Fish that are the same species
Same food you and I eat. Just because they live in colder areas dosent mean they live in igloos and live on frozen fish as their diet.
Seahorses cannot live with other types of fish because seahorses are slow feeders and can't get their share of food before the other fish eat it all. Seahorses can live with other seahorses,though!
according to my calculations all fish are not the same because they aren't all the same kind of fish, don't do the same stuff and function differently.
no a tetra fish has a shiny streak
No! because tropical fish live in heated water and koi in cold water.
maybe
Clumped
Clumped
Clumped
Of course they can, fish can live with any other fish. Every body knows that!
A gold fish or a beta fish should be a good starter fish.