How do you tell them apart? Especially things like neons? I give my fish names if I can distinguish them. The Julii cories are Abie and Sadie. The Agasizzi cories are Seymour and Prudence. The bronze cory is Biff.
I like to say that the four albino tiger barbs are Groucho, Harpo, Chico and Zeppo; and the three regular tiger barbs are Moe, Larry and Curly, but I really don't know which is which.