This post is old, but I googled 'counterfeit silver dollar tetra' and this post appeared on the list. I just bought 3 of them from one of the local fish stores but they were called Counterfeit Silver Tetra and look slightly different from the pic that is posted on this thread. They are similer, but look more like a cross between the fish posted here and Diamond Tetras. Mine have the same body shape, but have an orangish/reddish spot on the upper eye like a Diamond, mine also have the irridescent shimmer like a Diamond, but the fins are greyish instead of opalescent like the Diamond. Mine also dont have the black spot right before the tailfin like the one pictured here. Also, on mine there is a hint of two verticalish bands right after the eyes but before the midsection. I have to also say that they are semi aggresive within their own and similerly shaped tets. Anyone have a more sense as to what these are?