What cold water fish can be kept together?

You shouldn't keep long goldfish and the small fat ones tgether as they will just compete for food and as the small ones are not as quick they are likely not to be fed!

however i have 2 long ones and 7 stumpy ones and they seem to be fine in the same tank! i olso have 3 small shrimps and neon fish i am going to add more fish to my tank this weekend but am not quite sure what ones yet!i hope that as of some help!