Different varieties of same species

[dewilde2]

I am wanting to add more fish to my tank- I currently have a 29g- I have 2 sunset coral dwarf platys (about 3/4" long) and 1 spotted catfish cory. I want to add to both of these species, but am wondering if they will school with different varieties of the same species. For instance- will the dwarf platys school with regular platys? Same with the corys- I have seen some other cool looking varieties, but don't want the one I have to be all alone in the world. Do they need to be similar sizes? I almost bought some more of the same variety of corys today at the store, but they were all much bigger than the one I have, so I wasn't sure. THanks for the advice-

[Mgamer20o0]

my platies really dont school. platies are the same. its just they breed traits. kind of like guppies some have yellow some have blue ext.

[dorkfish]

The different varietys of corys are not the same species, and corys are relluctant/won't school with other species of corys in in my expierience.

[thesydmonster]

It is best to get the same type of cory that you already have, you will be rewarded with fun, natural cory behavior :)