OK.. yeah, I certainly know that happens. The same LFS sells 'Julii cories,' but they're one ofthe other close species. Though they still charge an appropriate price for the actual fish they're selling so I don't complain. I'll do my best to make sure they're right. At least now I've seen the green fire devils so I know what to compare to!
I have decided to go ahead with a full South American theme. I wouldn't go as far as to say a biotope, but I'm going to go with cories, instead of the loaches. Not sure if maybe 7 cories, (probably whatever the fake julii kind I've purchased before, I like how small they stay), and 7 marbled hatchets and then my school of either cardinals or neon green tetras - say 13? I don't think that'd be over stocking, but I also don't want any of the schools to be lacking in numbers.
Going to plant some alternathera, micro sword and probably some star grass or maybe an interesting looking sword if I find one I like. And I've got some Amazon frog bit on the way already. :)